Proteins in this family are bacteriophage GP30.3 proteins. Their function is poorly characterised [1][2].

1: Cloning and expression of genes from the genomic region between genes cd and 30 of bacteriophage T4. Zajanckauskaite A, Raudonikiene A, Nivinskas R; Gene 1994;147:71-76. PMID:8088550

2: A rare type of overlapping genes in bacteriophage T4: gene 30.3' is completely embedded within gene 30.3 by one position downstream. Zajanckauskaite A, Malys N, Nivinskas R; Gene 1997;194:157-162. PMID:9272856