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Expression of CPL4p::GUS in Arabidopsis leaves and roots. (a) CPL4p::GUS expression in cotyledons and true leaves of 7-day-old seedlings. Arrowheads indicate hydathodes; (b) CPL4p::GUS expression in two-week-old rosette leaves; (c) CPL4p::GUS expression in roots of 7-day-old seedlings; (d) CPL4p::GUS expression in roots of two-week-old plants. Scale bars, 1 mm ([a] and [b]), 100 μm ([c] and [d]).
