A 3-month-old female is hospitalized with a variety of health problems consistent with severe inflammation affecting multiple tissues. Laboratory tests reveal that the patient lacks a cell population with the following phenotype: CD4+, CD25*, FoxP3*. The patient most likely suffers from a deficiency in a cell type that regulates T cell activation by which of the following mechanisms? a. Induction of receptor editing b. Secretion of IL-3 c. Induction of dendritic cell maturation d. Consumption of IL-2 Oe. Induction of thymic involution

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.