| http://www.w3.org/ns/prov#value | - Other preferred embodiments include those peptides wherein each of X1 and X9 is independently selected from the group consisting of R, K, Orn, Dab and Har or hydrophobic; preferably X1 is R, K, Har and X9 is R, K, Har or hydrophobic, especially I, V, L, W, F or Y. However, each of X1 and X9 may be absent.
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