Family of Bacillus insecticidal crystal toxins. Strains of Bacillus that have this insecticidal activity use a binary toxin comprised of two proteins, P51 and P42 (this family). Members of this family are highly conserved between strains of different serotypes and phage groups [1].

1: Variants of the Bacillus sphaericus binary toxins: implications for differential toxicity of strains. Humphreys MJ, Berry C; J Invertebr Pathol 1998;71:184-185. PMID:9500937