Examples of {TAIL ~ conservative substitutions} with non conventional amino acids are described in {HEAD ~ Rosenberg} et al 
Examples of { TAIL ~ conservative substitutions } with non conventional amino acids are described in { HEAD ~ Rosenberg } et al
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH