Just looked at 2 cluster AO2 phages, JKerns and StevieBAY. StevieBAY's gene 28 is an endolysin. It possesses all of domains we expect to see in an endolysin. Gene 64 codes for the CHAP endopeptidase domain of LysK (a Staphylococcus phage lysin gene). It is reported out as an endolysin also.
We won't call either of them lysin A (Reserved only for mycobacteriophages for now, unless the phage genomes contains a lysin A and a lysin B.
Edited 19 Feb, 2020 18:17