part of postsynaptic density membraneless organelle postsynaptic specialization, intracellular component postsynaptic density, intracellular component A network of proteins adjacent to the postsynaptic membrane forming an electron dense disc. Its major components include neurotransmitter receptors and the proteins that spatially and functionally organize neurotransmitter receptors in the adjacent membrane, such as anchoring and scaffolding molecules, signaling enzymes and cytoskeletal components. GO:0099092 cellular_component