Nucleic acid molecules which encode peptides having an amino acid sequence identity of at least about 93%, more preferably at least about 95%, and most preferably at least about 98 99% over the entire sequence with {HEAD ~ a sequence} set forth in SEQ ID NO:2, {TAIL ~ SEQ ID NO:4}, SEQ ID NO:6, SEQ ID NO:8, or SEQ ID NO:14 are also within the scope of the invention 
Nucleic acid molecules which encode peptides having an amino acid sequence identity of at least about 93 % , more preferably at least about 95 % , and most preferably at least about 98 99 % over the entire sequence with { HEAD ~ a sequence } set forth in SEQ ID NO:2 , { TAIL ~ SEQ ID NO:4 } , SEQ ID NO:6 , SEQ ID NO:8 , or SEQ ID NO:14 are also within the scope of the invention
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