specifically , infected cells maintained in medium containing either canavanine , an analogue of arginine , or azetidine-2-carboxylic acid an analogue of proline and hydroxyproline , synthesized alpha polypeptide at rates comparable to maximal rates in untreated infected cells but did not undergo the normal transition to beta and gamma polypeptide synthesis .
C0033382
proline
C0020388
hydroxyproline