In {TAIL ~ an alternative embodiment}, the portion is selected from SEQ ID NO:33, SEQ ID NO:34, SEQ ID NO:35, SEQ ID NO:36, {HEAD ~ SEQ ID} NO:37 and SEQ ID NO:38 
In { TAIL ~ an alternative embodiment } , the portion is selected from SEQ ID NO:33 , SEQ ID NO:34 , SEQ ID NO:35 , SEQ ID NO:36 , { HEAD ~ SEQ ID } NO:37 and SEQ ID NO:38
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH