| http://www.w3.org/ns/prov#value | - A method for sterilizing an animal, said method comprising administering an effective amount of a conjugate compound having the general formula ##STR6## wherein X is an amino acid selected from the group consisting of lysine, D-lysine, ornithine, D-ornithine, glutamic acid, D-glutamic acid, aspartic acid, D-aspartic acid, cysteine, D-cysteine, tyrosine and D-tyrosine; Y is a linking agent selected
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