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Starch accumulation precedes chlorosis in psc mutant leaves. (A and C) Leaf photographs. (B and D) Same leaves cleared and IKI stained. (A and B) Wild type. (C and D) psc mutant. Arrow points to a region in a psc mutant leaf that has hyperaccumulated starch and progressed to chlorosis, whereas the arrowhead shows a region that has begun to hyperaccumulate starch but has not yet progressed to chlorosis.
