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Developmental arrest of an abp1 mutant embryo at the globular stage. Shown here is a confocal image of an abp1 embryo. In contrast to normal wild-type embryos, abp1 mutants lack the characteristic cell arrangement and shape that represents the incipient shoot and root anlagen. The suspensor apparatus of abp1 embryos fails to degenerate. Aberrant division in the apical suspensor gives rise to twinned cells. (For details, see Chen et al., p. 902.)