... the processing stem, gave rise to rRNA with the majority of termini in the mature form, whereas pD3, with amutation on the 3¢-side, gave rise rRNA with the majority of the termini in the )7 form. In ... elongation, termination, and recy-cling. Initiation is the rate-limiting step [1]. This phaseis mediated by initiation factor 1 (IF1), initiation fac-tor 2, and initiation factor 3. IF1 is the ... fractions,respectively. In particular, there was an increase in the relative amount of the fully mature terminus, with aconcurrent decrease of the ) 7 species in the 70S frac-tion as compared with the 50S fraction....