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In a recent study, Jones et al. (7) reported on the translocation of C14 in tobacco following assimilation of C1409 by a single leaf (the presentation leaf or source leaf). The labeled CO, was supplied for varying, periods of time (10 min to 3 hr) after which photosynthesis was continued in normal air for the duration of the experiment (up to 96 hr, continuous light). There was a complete turnover of the su-
Geiger et al. (Thu,) studied this question.