Hepatic lipase often found bound to HSPG, heparan sulfate proteoglycans (HSPG), keeping HL inactive and unable to bind to HDL (high density lipoprotein) or IDL (intermediate density lipoprotein). When it is free in the bloodstream, however, it is found associated with HDL to maintain it inactive. This is because the triacylglycerides in HDL serve as a substrate, but the lipoprotein contains proteins around the triacylglycerides that can prevent the triacylglycerides from being broken down by HL. One of the principal functions of hepatic lipase is to convert intermediate-density lipoprotein (IDL) to low-density lipoprotein (LDL). Hepatic lipase thus plays an important role in
Adjective phrase 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 and adjective phrases function in two basic ways, attributively or predicatively.