Portal protein B Minor capsid protein B B Forms the portal vertex of the prohead, the central hole of the portal vertex is the opening through which DNA passes during packaging and injection. MKTPTIPTLLGPDGMTSLREYAGYHGGGSGFGGQLRSWNPPSESVDAALLPNFTRGNARADDLVRNNGYAANAIQLHQDHIVGSFFRLSHRPSWRYLGIGEEEARAFSREVEAAWKEFAEDDCCCIDVERKRTFTMMIREGVAMHAFNGELFVQATWDTSSSRLFRTQFRMVSPKRISNPNNTGDSRNCRAGVQINDSGAALGYYVSEDGYPGWMPQKWTWIPRELPGGRASFIHVFEPVEDGQTRGANVFYSVMEQMKMLDTLQNTQLQSAIVKAMYAATIESELDTQSAMDFILGANSQEQRERLTGWIGEIAAYYAAAPVRLGGAKVPHLMPGDSLNLQTAQDTDNGYSVFEQSLLRYIAAGLGVSYEQLSRNYAQMSYSTARASANESWAYFMGRRKFVASRQASQMFLCWLEEAIVRRVVTLPSKARFSFQEARSAWGNCDWIGSGRMAIDGLKEVQEAVMLIEAGLSTYEKECAKRGDDYQEIFAQQVRETMERRAAGLKPPAWAAAAFESGLRQSTEEEKSDSRAA Protein B* 533 PORTL_LAMBD GpB