This family of proteins contains the MT0933 protein Swiss:O05901 which has been identified as an antitoxin to /protein MT0934 [1]. This family of proteins is found in bacteria. Proteins in this family are typically between 61 and 90 amino acids in length.

1: Comprehensive functional analysis of Mycobacterium tuberculosis toxin-antitoxin systems: implications for pathogenesis, stress responses, and evolution. Ramage HR, Connolly LE, Cox JS; PLoS Genet. 2009;5:e1000767. PMID:20011113