In certain of these embodiments, Y is a peptido conjugate of Tyrosine; q is 3; and r is 1. [0096] The present invention provides an isolated epitope comprising the formula [0097] Wherein: [0098] G is Glycine [0099] E is Glutamate [0100] D is Aspartate [0101] Y is Tyrosine [0102] S is sulfate or a sulfated molecule [0103] X is any amino acid except the above [0104] z is 0, 1, or 2 [0105] t is 1, 2