This family consists of several Staphylococcus aureus bacteriophage RinB proteins and related sequences from their host. The int gene of staphylococcal bacteriophage phi 11 is the only viral gene responsible for the integrative recombination of phi 11. rinA and rinB, are both required to activate expression of the int gene [1].

1: Cloning, sequencing, and genetic characterization of regulatory genes, rinA and rinB, required for the activation of staphylococcal phage phi 11 int expression. Ye ZH, Lee CY; J Bacteriol 1993;175:1095-1102. PMID:8432703