Hepatic stellate cell in the cell body store vitamin A as retinol ester. The function and role of quiescent hepatic stellate cells is unclear. Recent evidence suggests a role as a liver-resident antigen-presenting cell, presenting lipid antigens to and stimulating proliferation of NKT cells. When the liver is damaged, stellate cells can change into an "activated" state. The activated stellate cell is characterized by proliferation, contractility, and chemotaxis. This state of the stellate cell is the main source of extracellular matrix production in liver injury. This attribute makes it a key factor in the pathophysiology of the liver. The amount of stored vitamin
Adjective phrase phrase: The following trees illustrate the structure of head-medial adjective phrases: Adjective phrase An adjective phrase (or adjectival phrase) is a phrase the head word of which is an adjective, e.g. "fond of steak", "very happy", "quite upset about it", etc. The adjective can initiate the phrase (e.g. "fond of steak"), conclude the phrase (e.g. "very happy"), or appear in a medial position (e.g. "quite upset about it"). The dependents of the head adjective—i.e. the other words and phrases inside the adjective phrase—are typically adverb or prepositional phrases, but they can also be clauses (e.g. "louder than you are"). Adjectives