Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention relates to the expression and screening of genomic DNA sequences encoding uncharacterized genes and proteins. The present invention provides systems utilizing unique features of retroviral replication to analyze uncharacterized genes derived from genomic DNA samples. In preferred embodiments, a segment of genomic DNA is inserted between 5′ and 3′ viral long terminal repeats (LTRs) in a vector (e.g., a plasmid, cosmid, or artificial chromosome vector). The resulting vector (or library of vectors containing a plurality of independent genomic sequences) is then introduced into a retroviral packaging cell. The resulting provirus or proteins expression from the provirus are then analyzed.

Abstract: The present invention relates to the production of proteins in host cells, and more particularly to host cells containing multiple integrated copies of an integrating vector comprising an exogenous gene. The present invention further relates to the use of integrating vectors lacking a selectable marker and growth of host cells containing such vectors in the absence of selection. The present invention further provides methods of expressing increased levels of protein in host cells using such vectors.

Abstract: The present invention relates to the production of proteins in host cells, and more particularly to host cells containing multiple integrated copies of an integrating vector. Suitable integrating vectors for use in the present invention include retrovirus vectors, lentivirus vectors, transposon vectors, and adeno-associated virus vectors. Methods are provided in which the host cells are prepared by using the integrating vectors at a high multiplicity of infection. The host cells are useful for producing pharmaceutical proteins, variants of proteins for use in screening assays, and for direct use in high throughput screening.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention relates to the use of a mammary specific .alpha.-lactalbumin protein to assist in the production of recombinant proteins in mammals' milk. The invention also relates to the genetically engineered mammal that produces the desired recombinant product in its milk and to the products produced by the genetically engineered mammal, including the altered composition of milk and the semen which includes the desired .alpha.-lactalbumin protein DNA sequence.

Abstract: A medium and method for blotting macromolecules is disclosed. The method begins with the separation of macromolecules on a slab gel. Next, a sheet of cellulosic paper is dipped into an alcohol bath. The dipped paper is placed against the slab gel. The paper and the gel are exposed to a means for transferring the macromolecules from the gel onto the paper. In a particularly advantageous embodiment of the method, the paper is dipped into a methanol bath, the transferring means includes an electric field, and the paper is either xerographic paper or cotton bond paper. The present invention is also a medium for blotting macromolecules comprising a piece of cellulosic paper that has been dipped in alcohol.

Abstract: The present invention relates to the use of a mammary specific .alpha.-lactalbumin regulatory sequence to assist in the production of recombinant proteins in mammals' milk. The invention also relates to the genetically engineered mammal that produces the desired recombinant product in its milk and to the products produced by the genetically engineered mammal, including the altered composition of milk and the semen which includes the desired .alpha.-lactalbumin protein DNA sequence.

Abstract: Portions of the genetic sequence coding for bovine placental lactogen are isolated and a cDNA variant of a bovine placental lactogen gene is then formed and isolated. Upon cloning of the cDNA gene sequence and culturing of a resulting host, large quantities of bovine placental lactogen can be produced.

Abstract: Portions of the genetic sequence coding for bovine placental lactogen are isolated and a cDNA variant of the bovine placental lactogen gene is then formed and isolated. Upon cloning of the cDNA gene sequence and culturing of a resulting hose, large quantities of bovine placental lactogen can be produced.