{TAIL ~ Box B} lies 21 amino acids C terminal to {HEAD ~ Box A} from amino acids 43 139 
{ TAIL ~ Box B } lies 21 amino acids C terminal to { HEAD ~ Box A } from amino acids 43 139
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH