The differentiation is based on a set of activation / inactivation of genes (parts of DNA) via complex cascades of regulation. We can not consider a differentiating cell individually. Indeed, its "expression profile" depends on its environment: cell-cell interactions, cell-matrix. It is these extra-cellular signals that will trigger the internal regulation signals. The establishment of plans for the organization of a Drosophila embryo or the development of limb buds in mice are well-known models. In these models, so-called "positional" information plays a large role: a substance present in the form of a concentration gradient in the extracellular medium will trigger or not intracellular signals depending on the dose at which the cells are exposed along this gradient.
Answer:
Option (2).
Explanation:
Skin may be defined as the largest organ of the body. Skin provides the first line of defense in the organisms. The skin secretes different enzymes and chemicals that kill the pathogens.
The patient with the burned skin are more susceptible to the pathogen and has weakened immune system. To cover the burned skin surface, skin can be taken from the other body parts as the skin has the same property and shows the same antigen as the replaced skin.
Thus, the correct answer is option (2).
depends if the ct catches it and if the feedback is in detail
Sarcoidosis can<span> easily be </span>mistaken for other systemic and especially metastatic disease.
Metastatic disease is w<span>hen many cancer cells are found in one or more nearby lymph nodes, it is known as regional </span>disease<span> or stage III cancer. Cancer cells can travel to lymph nodes far from the primary tumor or to other organs or tissues in the body, where they collect to form a </span>metastatic<span> tumor.</span>