Styrene-maleic acid copolymers are used to create native nanodiscs that mimic the environment of these structures. Partially immobilized annular shells may bind to this structure’s proteins while interacting with certain “bulk” compounds. In models, these structures can coexist in gel, liquid-ordered, and liquid-disordered phases. (15[1]-5[1])Eicosanoids are produced in a pathway that [emphasize] originates from one of these structures in which enzymes like ALOX5 and COX1 act on arachidonic acid, (-5[1])which is released from that structure. (-5[1])(*) Prostaglandins are derived from these structures, which contain sphingolipid-rich “rafts.” (10[2])Unlike peptide hormones, steroid hormones can cross these structures, (10[8]-5[1])which contain (10[1])amphipathic molecules (-5[1])with hydrophobic tails (10[2])and a hydrophilic (10[2])head as seen in the fluid mosaic model. For 10 points, phospholipid bilayers (0[1])comprise what protective (10[1])structures? (10[4])■END■