TABLE 1.

CPD removal from the transcribed strand of the EcoRI fragment of the hprt gene

Cell line (exons)	Mean ± SEM CPD frequency per fragment at h:		% Repair after 24 h
	0	24
V79 (6–9)	0.78 ± 0.06	0.10 ± 0.12	87
RH1-26 (3–5)	0.71 ± 0.12	0.31 ± 0.04	56
RH1-26 (6–9)	0.75 ± 0.17	0.68 ± 0.23	9