sentence: This set of four genes ( Fig. 9A ) encodes a Hcp protein ( Hcp2 ) , a VgrG protein ( VgrG14 ) , a putative protein of unknown function ( PA14_43090 ) , and a Rhs element ( PA14_43100 ) named RhsP2 ( Fig. 9B ) ( 49 ) and also carries a C-terminal domain ( RhsP2-CT ) .