Figure 254

Electron micrographs of nuclei from two different cell types.

The large electron micrograph shows the nucleus of a nerve cell. Two nucleoli are included in the plane of section. The nucleus of this active cell, exclusive of the nucleoli, is comprised almost entirely of extended chromatin or euchromatin. xl0,000. Inset. The smaller nucleus belongs to a circulating lymphocyte (the entire cell is shown in the micrograph). It is a relatively inactive cell. Note the paucity of cytoplasm and cytoplasmic organelles. The chromatin in the nucleus is largely condensed (heterochromatin). The lighter areas represent euchromatin. X13,000.

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