Abstract: An object of the present invention is to provide a method for efficiently producing a heparin-like substance without using an animal-derived tissue. The present invention relates to a method for producing a heparin-like substance and the like, the method comprising: (1) preparing a mammalian cell that produces a heparin-like substance, (2) preparing a recombinant cell in which a gene that encodes an extracellular domain of syndecan is introduced into the mammalian cell that produces a heparin-like substance and is prepared in step (1), and (3) culturing the recombinant cell prepared in step (2) in a medium and collecting the heparin-like substance from the resulting culture supernatant.

Abstract: There are provided a recombinant cell that enables efficient production of protein, a method for producing the same, and a method for producing protein by using the cell. The cell is a mammalian cell having integrated therein 3 or more expression units containing an exogenous gene of interest, wherein gap elements are provided among multiple expression units, wherein the gap elements are designed to have chain lengths of 0.5 kbp or more, and the gap elements are mutually different sequences. Such a cell can produce recombinant protein stably for a long period and, especially, can show a strong positive linear correlation between the number of genes of interest introduced therein and the expression levels.

Abstract: The present invention has its object to provide a transgenic bird producing erythropoietin at high concentration levels as well as a method for constructing the same. The present invention provides a G0 transgenic chimera bird as obtained by incubating a fertilized avian egg, infecting the early embryo formed after egg laying, except for the blastoderm stage immediately following egg laying, with a replication-deficient retroviral vector containing a foreign erythropoietin gene and allowing the embryo to hatch.

Abstract: The present invention provides a G1 transgenic bird or an offspring thereof by: incubating a fertilized avian egg, microinjecting, into the early embryo thereof at a stage except for and after the blastodermic stage just after egg laying, a replication-deficient retroviral vector coding for a useful protein, allowing the egg to hatch out to thereby obtain a G0 transgenic chimeric bird, and mating the G0 transgenic chimeric bird with another G0 transgenic chimeric bird or an offspring thereof or with a wild-type bird.

Abstract: The present invention provides a lentivirus vector which comprises a coat protein containing VSV-G; a recombinant bird host which is constructed by infecting a bird host with the lentivirus vector; a method of constructing the same; a transgenic chimeric bird which is constructed by infection with the lentivirus vector and offspring thereof. The present invention also provides a method of constructing a G0 transgenic chimeric bird and offspring thereof which comprises infecting fertilized bird egg early embryos with a lentivirus vector comprising a coat protein containing VSV-G, and incubating the embryos; and a G0 transgenic chimeric bird and offspring thereof which is constructed by the method mentioned above. The present invention provides a transgenic bird which is constructed by infecting a bird early embryos with a lentivirus vector comprising a coat protein pseudotyped with VSV-G.

Abstract: The present invention has for its object to provide a G0 transgenic chimera bird which is introduced an antibody gene with a replication-defective retrovirus vector, and produces an antibody by expressing the transgene; a production method of an antibody which comprises recovering the antibody expressed by the produced G0 transgenic chimera bird; and a production method of a G0 transgenic chimera bird which comprises incubating a bird fertile egg, and injecting an embryo after and exclusive of a period immediately after the start of incubation with a retrovirus vector. That is, the present invention relates to a G0 transgenic chimera bird which is introduced an antibody gene with a replication-defective retrovirus vector, and produces an antibody by expressing a transgene.

Abstract: The present invention relates to G0 transgenic chimeric birds capable of transmitting a desired gene or gene arrangement to offspring with very high efficiency and to a method of producing the same, and relates to G0 transgenic chimeric birds having a desired gene or gene arrangement in germ cells with very high efficiency and to a method of producing the same. A G0 transgenic chimeric bird which comprises a G0 transgenic chimeric bird resulting from gene transduction using a replication-defective retrovirus vector and that the efficiency of transgene transmission to G1 is not less than 10%.

Abstract: The invention has a object to provide a G0 transgenic chimera bird which can efficiently accumulate the useful protein in eggs of a female bird in which the protein is expressed in an oviduct-specific manner and can accumulate even a toxic protein in eggs with no ill effect for birds, and a transgenic bird and a method of producing them. The above object can be attained by providing a G0 transgenic chimera bird and transgenic bird obtained by introducing a replication-defective retrovirus vector coding for a useful protein by an oviduct-specific expression promoter.

Abstract: A biocatalyst is immobilized with a graft product of a polymer and saponified polyvinyl acetate containing a stilbazolium group as a photo-crosslinking group. The polymer is preferably gelatin, collagen, starch, cellulose, gum arabic, tragacanth gum, carrageenan, mannan, dextrin or alginic acid. The graft product is prepared by bonding the polymer to the polyvinyl acetate, either directly through functional groups of the polymer and polyvinyl acetate or through a crosslinking agent. The polymer provides affinity for the biocatalyst and by grafting the polymer to the saponified polyvinyl acetate, damage to cells upon immobilization is reduced. A liquid composition containing a biocatalyst and the graft product is added to an aqueous solution of an inorganic salt or an organic salt to form a granular gel and the gel is irradiated with actinic rays to cure the gel.