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The impact of o7 mutant alleles on PB structure. (A and B) PBs seen under TEM as well-shaped discrete structures in normal endosperm (A) vs. structures with striking invaginations of the membrane in o7-ref endosperm (B). (C and D) Severe reduction in the number of PBs in the o7-6 endosperm (D) vs. normal endosperm (C).
