gbz:JZM60_07225 K11903 type VI secretion system secreted protein Hcp | (GenBank) Hcp family type VI secretion system effector gbz:JZM60_07220 K11900 type VI secretion system protein ImpC | (GenBank) tssC; type VI secretion system contractile sheath large subunit gbz:JZM60_07215 K11901 type VI secretion system protein ImpB | (GenBank) tssB; type VI secretion system contractile sheath small subunit