Generic embryonic cells become specialized cells through cell differentiation. Gene expression is a process that causes something to happen. Gene expression, which is the exact set of genes that are switched on or off, controls how a cell behaves.
The trajectory that specific stem cells take when they differentiate appears to be determined by transcription factors, proteins that control which genes are produced in a cell.
The process of specialization that results in the development of brain, heart, and all other tissues from the single-cell zygote and the primitive, three-layered embryo is known as cell differentiation.
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