|the movement of ions or molecules across a cellular membrane from a lower to a higher concentration|
|one of the cells that take part in the formation of the body, becoming differentiated into the various tissues, organs, etc.|
chromatin chro·ma·tin (krō'mə-tĭn)
A complex of nucleic acids and proteins in the cell nucleus that stains readily with basic dyes and condenses to form chromosomes during cell division.
|chromatin (krō'mə-tĭn) Pronunciation Key
The substance distributed in the nucleus of a cell that condenses to form chromosomes during cell division. It consists mainly of DNA and proteins called histones.