However, in the case of fAla transfer (Fig. , Table ), we found the rate constants of formation of 2'/3'-fAla-ester and the new species to be nearly identical (0.0066 min -1 and 0.0067 min -1 respectively). In the case of fGly transfer (Fig. . Table ), the integration of the new peaks was 2-fold higher than the integration of the 2'/3'-fGlyester peak. All these observations suggest that the new peaks did not correspond to bisspecies, but instead indicated the formation of 2'/3'-formyldipeptidyl-esters.