This domain family is found in bacteria and viruses, and is typically between 49 and 166 amino acids in length. The family is found in association with Pfam:PF03906. In T-even phages, gp37 and gp38 are components of the tail fibre that are critical for phage-host interaction.

1: Characterization of the distal tail fiber locus and determination of the receptor for phage AR1, which specifically infects Escherichia coli O157:H7. Yu SL, Ko KL, Chen CS, Chang YC, Syu WJ; J Bacteriol. 2000;182:5962-5968. PMID:11029414