“…They identified cell surface antigens in reduced rodent/human somatic cell hybrids by monoclonal anti bodies. Carlin (1983) found correlation between expression of a cell surface polypeptide (MW 250kd,pi 8.3, gene symbol PCH2) and retention of human chromosome 5 in human/mouse cell hybrids. In an in situ hybridization study with the cloned genes for C0L1A1 and C0L1A2, Retief et al (HGM8) noticed significant cross hybridization to other chromosomes than 17 and 7, including 5q23-31.…”