The oily fatty interior of the membrane rasies issues for protein sturcture as does the hydrophillic head as this puts pressue on interactions proteins can make.
Integral membrane proteins - embed fully into membrane and usually trasnverse it
Peripheral membrane proteins - bulk of surface within aqueous environment around membrane. These are not embedded they associate with the surface via other proteins or the head group of lipids
Lipid-anchor proteins - Bulk outside but attched to membrane via lipid anchors. These are essentially peripheral proteins
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