He became convinced ofthis through his studies of the salamander protein Prod 1, which servesas a road map for cell regrowth in salamanders and newts (SN: 11/3/07, p. 276).

通过对火蜥蜴蛋白质Prod 1(火蜥蜴和蝾螈细胞再生的重要标志)的研究，使他更加确认了这一点。