21. Some may also contain regularly spaced prolines and arginines. 22. This enzyme participates in arginine and proline metabolism and glyoxylate and dicarboxylate metabolism. 23. This enzyme participates in arginine and proline metabolism and aminoacyl-trna biosynthesis. 24. PABPC4 contains 4 RNA-binding domains and proline -rich C terminus. 25. The protein encoded by this gene is a proline -rich salivary protein. 26. PH domain, and several proline -rich sequences. 27. MBH reaction can involve proline derivative as a cocatalyst. 28. Asymmetric synthesis of the Wieland-Miescher ketone is also based on proline . 29. These proline -derived auxiliaries and catalysts, including the CBS-oxazaborolidines. 30. This modification of the proline residue increases the stability of the collagen triple helix.