Complex chromosome rearrangements (CCR) involving multiple breaks in two chromosomes are rare. The detection of a four-break apparently balanced rearrangement involving chromosomes 1 and 3 in a child with developmental delay led us to reanalyse, using prometaphase banding, another complex two-chromosome rearrangement in a previously reported case (Fitzgerald 1974). The relationship between clinical abnormalities and apparently balanced rearrangements is discussed.
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Voullaire et al. (1988) studied this question.
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