In the United States, about 600,0001 people have PKD, and cystic disease is the fourth leading cause of kidney failure. Autosomal dominant PKD is the most common inherited form. Symptoms usually develop between the ages of 30 and 40, but they can begin earlier, even in childhood.
In developmental biology, cellular differentiation is the process where a cell changes from one cell type to another. Most commonly this is a less specialized type becoming a more specialized type, such as during cell growth. Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types.
Full Definition of SEPARATION. 1. : the act or process of separating: the state of being separated. 2. a: a point, line, or means of division.3. a: cessation of cohabitation between a married couple by mutual agreement or judicial decree b: termination of a contractual relationship (as employment or military service).edical Definition of SEPARATION. 1. : the process of isolating or extracting from or of becoming isolated from a mixture; also: the resulting state.