A composition comprising a population of isolated peptides, said population comprising three or more different peptides, wherein each peptide in the population comprises a sequence of: (i) SEQ ID NO: 3, wherein X 5 is an amino acid selected from the group consisting of V or A, X 7 is an amino acid selected from the group consisting of G, I or H, X 11 is an amino acid selected from the group consisting of E, N, or Q, X 18 is an amino acid selected from the group consisting of D or N, X 21 is an amino acid selected from the group consisting of R, D, or N, X 25 is an amino acid selected from the group consisting of Q, D, or E, X 28 is an amino acid selected from the group consisting of E or N, X 31 is an amino acid selected from the group consisting of L or V, X 45 is an amino acid selected from the group consisting of K or Q, X 48 is an amino acid selected from the group consisting of F or V, X 51 is an amino acid selected from the group consisting of D or N, X 54 is an amino acid selected from the group consisting of E or Q, X 57 is an amino acid selected from the group consisting of S or Q, X 60 is an amino acid selected from the group consisting of F or W, X 63 is an amino acid selected from the group consisting of I or V, and X 66 is an amino acid selected from the group consisting of Q or D; (ii) SEQ ID NO: 1, wherein X 9 is an amino acid selected from the group consisting of I, P or H, X 17 is an amino acid selected from the group consisting of I, W, or Y, X 21 is an amino acid selected from the group consisting of R, D, or N, X 28 is an amino acid selected from the group consisting of E or N, and X 31 is an amino acid selected from the group consisting of L or V; or (iii) SEQ ID NO: 9, wherein X 5 is an amino acid selected from the group consisting of V or A, X 7 is an amino acid selected from the group consisting of G, I or H, X 11 is an amino acid selected from the group consisting of E, N, or Q, X 21 is an amino acid selected from the group consisting of R, D, or N, X 25 is an amino acid selected from the group consisting of Q, D, or E, X 28 is an amino acid selected from the group consisting of E or N, and X 31 is an amino acid selected from the group consisting of L or V. (i) SEQ ID NO: 3, wherein X 5 is an amino acid selected from the group consisting of V or A, X 7 is an amino acid selected from the group consisting of G, I or H, X 11 is an amino acid selected from the group consisting of E, N, or Q, X 18 is an amino acid selected from the group consisting of D or N, X 21 is an amino acid selected from the group consisting of R, D, or N, X 25 is an amino acid selected from the group consisting of Q, D, or E, X 28 is an amino acid selected from the group consisting of E or N, X 31 is an amino acid selected from the group consisting of L or V, X 45 is an amino acid selected from the group consisting of K or Q, X 48 is an amino acid selected from the group consisting of F or V, X 51 is an amino acid selected from the group consisting of D or N, X 54 is an amino acid selected from the group consisting of E or Q, X 57 is an amino acid selected from the group consisting of S or Q, X 60 is an amino acid selected from the group consisting of F or W, X 63 is an amino acid selected from the group consisting of I or V, and X 66 is an amino acid selected from the group consisting of Q or D; (ii) SEQ ID NO: 1, wherein X 9 is an amino acid selected from the group consisting of I, P or H, X 17 is an amino acid selected from the group consisting of I, W, or Y, X 21 is an amino acid selected from the group consisting of R, D, or N, X 28 is an amino acid selected from the group consisting of E or N, and X 31 is an amino acid selected from the group consisting of L or V; or (iii) SEQ ID NO: 9, wherein X 5 is an amino acid selected from the group consisting of V or A, X 7 is an amino acid selected from the group consisting of G, I or H, X 11 is an amino acid selected from the group consisting of E, N, or Q, X 21 is an amino acid selected from the group consisting of R, D, or N, X 25 is an amino acid selected from the group consisting of Q, D, or E, X 28 is an amino acid selected from the group consisting of E or N, and X 31 is an amino acid selected from the group consisting of L or V.