Answer;
-Inactivation; limited
Differentiation requires inactivation of particular genes to produce populations with limited capabilities that form tissues.
Explanation;
-Cell differentiation is how generic embryonic cells become specialized cells. This occurs through a process called gene expression.
-Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a cell functions.
-Gene expression plays a critical role in the morphological changes that take place in a developing embryo and fetus and in the differentiation of stem cells to form specialized cells.
The reason of why Brendon experience immense physical pain
and increased craving upon withdrawal because of physical dependence. Physical
dependence is a physical condition that occurs after a gradual drug withdrawal
in which the drug is being chronically used that upon withdrawal, it causes unpleasant
symptoms, mainly, physical.
Adenine, Cytosine, Guanine, and Thymine.