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Kinetics of RNA replication in the exponential phase. The S- and U-form replicase (112.5 nm) were incubated with template RNA (s130, 0.1 nm) at 37 °C (A) or 25 °C (B). As the replicase was excessive compared with template RNA, the RNA amplified exponentially. Replication by the U-form at 37 °C was not detected.
