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Transcription of the hammerhead ribozymes. (M) Mutant HHM; (N) wild-type HHN; (NTP) all native NTPs; (A) ATPαSe I and other natives; (C) CTPαSe I and other natives; (G) GTPαSe I and other natives; (U) UTPαSe I and other natives. One band from each cleavage is shown here, since the other band (12 nt) ran off the gel.
