A single strand or thread-like fiber of a chromosome visible during cell division, consisting of coiled DNA and proteins.
From Greek 'chroma' (color) + 'nema' (thread). This microscopic anatomy term comes from early 20th-century cytology when scientists observed chromosomes separating.
During cell division, chromosomes condense so tightly that under the microscope they look like colorful threads—those threads are chromonema, and they're actually millions of bases of DNA wrapped up incredibly tightly.
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