Human cells growing in vitro attached to the substratum express a cell antigen called 28.3.7 identified by a species-specific monoclonal antibody. This antigen is not expressed on cells growing in suspension. The antigen has a molecular weight of 95,000. The gene is symbolized MIC7 (for monoclonal and Imperial Cancer, the laboratory where it was identified, plus 7 for the sequential monoclonal in that laboratory). The antigen is a marker for macrophage differentiation (Blaineau et al., 1983).
The MIC7 gene maps to human chromosome 15, according to the results of somatic cell hybrid studies (Blaineau et al., 1983).
Blaineau, C., Avner, P., Tunnacliffe, A., Goodfellow, P. 'Attached cell' antigen 28.3.7 mapping to human chromosome 15 characterises TPA-induced differentiation of the promyelocytic HL-60 cell line to give macrophage/monocyte populations. EMBO J. 2: 2007-2012, 1983. [PubMed: 6641710] [Full Text: https://doi.org/10.1002/j.1460-2075.1983.tb01692.x]