Abstract: A method of identification of differentially expressed messenger RNA (mRNA) which consists of synthesizing from a set of sequences of mRNA sets of fragments of complementary DNA (cDNA), which are separated with the aid of gel electrophoresis and the pictures of separation of the cDNA from different types of cells are compared and fragments with differential signal intensity are identified. For formation of the set of fragments the cDNA is cleaved with the aid of restriction nucleases. A method of cloning of differentially expressed mRNAs consists of synthesizing from sets of sequences of mRNAs from different types of cells sets of fragments of complementary DNA (cDNA) which are separated with the aid of gel electrophoresis, the pictures of the separation of the cDNA from different types of cells are compared, fragments of cDNA with different signal intensities are separated from the gel, amplified with the aid of a polymerase chain reaction and cloned to a plasmid or phage vector.

Abstract: The present invention provides an isolated nucleic acid encoding KIAA0918, an isolated nucleic acid that hybridizes under high stringency conditions to a nucleic acid that is complementary to a nucleic acid encoding KIAA0918, a purified KIAA0918 protein, a purified protein encoded by a nucleic acid that hybridizes under high stringency conditions to a nucleic acid that is complementary to a nucleic acid encoding KIAA0918, a method of making KIAA0918 protein, an antibody specific for KIAA0918, a method for producing an antibody specific for KIAA0918 protein, a vector comprising a nucleic acid encoding KIAA0918, and a host cell transformed with a vector comprising a nucleic acid encoding KIAA0918. Also provided are methods for detecting the presence of and isolating hematopoietic stem cells in a heterogeneous cell suspension and for assessing gene expression in a tissue sample.