hol:HORIV_58310 K11903 type VI secretion system secreted protein Hcp | (GenBank) hypothetical protein hol:HORIV_58290 K11900 type VI secretion system protein ImpC | (GenBank) type VI secretion protein hol:HORIV_58300 K11901 type VI secretion system protein ImpB | (GenBank) type VI secretion system-associated protein