{HEAD ~ The one or more purified polypeptides} can be linked to a heterologous protein, an indicator reagent, an amino acid spacer, an amino acid linker, a signal sequence, a stop transfer sequence, {TAIL ~ a transmembrane domain}, a protein purification ligand, or a combination thereof 
{ HEAD ~ The one or more purified polypeptides } can be linked to a heterologous protein , an indicator reagent , an amino acid spacer , an amino acid linker , a signal sequence , a stop transfer sequence , { TAIL ~ a transmembrane domain } , a protein purification ligand , or a combination thereof
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH