This family contains Mab-21 and Mab-21 like proteins. In C. elegans these proteins are required for several aspects of embryonic development [2-3].

1: cDNA cloning of a human homologue of the Caenorhabditis elegans cell fate-determining gene mab-21: expression, chromosomal localization and analysis of a highly polymorphic (CAG)n trinucleotide repeat. Margolis RL, Stine OC, McInnis MG, Ranen NG, Rubinsztein DC, Leggo J, Brando LV, Kidwai AS, Loev SJ, Breschel TS, Callahan C, Simpson SG, DePaulo JR, McMahon FJ, Jain S, Paykel ES, Walsh C, DeLisi LE, Crow TJ, Torrey EF, Ashworth RG, Macke JP, Nathans J, Hum Mol Genet 1996;5:607-616. PMID:8733127

2: The mab-21 gene of Caenorhabditis elegans encodes a novel protein required for choice of alternate cell fates. Chow KL, Hall DH, Emmons SW; Development 1995;121:3615-3626. PMID:8582275

3: Requirement for Mab21l2 during development of murine retina and ventral body wall. Yamada R, Mizutani-Koseki Y, Koseki H, Takahashi N; Dev Biol. 2004;274:295-307. PMID:15385160