prosoplasia prosoplasia prosoplasia (from ancient greek: προσωπον prósopon , "face" + πλάσις plasis, "formation") is the differentiation of cells either to a higher function or to a higher level of organization. -plasia and -trophy anaplasia (structural differentiation loss within a cell or group of cells). aplasia (organ or part of organ missing) desmoplasia (connective tissue growth) dysplasia (change in cell or tissue phenotype) hyperplasia (proliferation of cells) hypoplasia (congenital below-average number of cells, especially when inadequate) metaplasia (conversion in cell type) neoplasia (abnormal proliferation) prosoplasia (development of new cell function) abiotrophy (loss in vitality of organ or tissue) atrophy (reduced functionality of an organ, with decrease in the number or volume of cells) hypertrophy (increase in the volume of cells or tissues) hypotrophy (decrease in the volume of cells or tissues) dystrophy (any degenerative disorder resulting from improper or faulty nutrition) assuming an increasing cellular peculiarity from a presupposed stem-cell fate, prosoplasia is therefore a forward differentiation, unlike anaplasia (a backward differentiation). examples of prosoplasia include the forward differentiation of cells in the mucosa in warthin's tumor.