The chromatin thread next becomes shorter and thicker, the nucleoli begin to disappear, and the thread breaks up into a number of segmentschromosomes-which vary in number in different species, but are fairly constant in the same species (fig. [Please select]
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#nucleoli#), a very small, dense, dark-staining body, either within the nucleus or near it. [Please select]
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A nerve cell is formed, with its protoplasm, its nucleus and its nucleoli before being irritated; its properties precede its functions. [Please select]
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