vmi:AL543_01380 K11903 type VI secretion system secreted protein Hcp | (GenBank) type VI secretion system tube protein Hcp vmi:AL543_02080 K11900 type VI secretion system protein ImpC | (GenBank) type VI secretion system contractile sheath large subunit vmi:AL543_02075 K11901 type VI secretion system protein ImpB | (GenBank) type VI secretion system contractile sheath small subunit