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Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass analyses of tryptic digested CTX1 and tryptic digested CTX3. The addition of semi-carbazide caused an increment of 57 Da. The mass of peptides with modified Asp in (A) tryptic-digested CTX1 and (B) tryptic-digested CTX3 were indicated by red letters.
