Abstract
NATURAL alterations in the number of chromosome sets appear to be uncommon among the somatic tissues of animals. Somatic haploidy has been claimed to occur in the micromeres of sea-urchin embryos1, and in the tail mesenchyme of tadpoles2. The former case was quickly denied3, while the latter is also better interpreted as the pairing of homologous chromosomes. Polyploidy is well known in mammalian liver and in various tumours, but rarely in other tissues.
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