6QZ9_2|Chains M[auth 0A], N[auth 0B], O[auth 0C], P[auth 0D], Q[auth 0E], R[auth 0F], S[auth 0G], T[auth 0H], U[auth 0I], V[auth 0J], W[auth 0K], X[auth 0L]|Proximal tail tube connector protein|Bacillus phage phi29 (10756) label=1