{HEAD ~ Conservative substitutions} include for example, replacement of {TAIL ~ glycine} for alanine, valine for isoleucine, leucine for isoleucine, aspartic acid for glutamic acid, lysine for arginine, asparagine for glutamine, phenylalanine for tryptophan, and tryptophan for tyrosine 
{ HEAD ~ Conservative substitutions } include for example , replacement of { TAIL ~ glycine } for alanine , valine for isoleucine , leucine for isoleucine , aspartic acid for glutamic acid , lysine for arginine , asparagine for glutamine , phenylalanine for tryptophan , and tryptophan for tyrosine
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH