In {TAIL ~ addition} to {HEAD ~ the sequence variation} between the various hh homologs, the vertebrate hedgehog proteins are apparently present naturally in a number of different forms, including a pro form, a full length mature form, and several processed fragments thereof 
In { TAIL ~ addition } to { HEAD ~ the sequence variation } between the various hh homologs , the vertebrate hedgehog proteins are apparently present naturally in a number of different forms , including a pro form , a full length mature form , and several processed fragments thereof
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