Main article: Nicotinic acetylcholine receptors. The nAChRs are ligand-gated ion channels, and, like other members of the cys-loop ligand-gated ion channel superfamily, are composed of five protein subunits symmetrically arranged like staves around a barrel.
Acrylonitrile butadiene styrene, otherwise known as ABS plastic, is a lightweight material popularly used in children's toys. There are two types: one suited for extrusion molding and one for injection molding. LEGO blocks are made from ABS plastic because it is so light and durable. Continue Reading.
You can identify this plastic by the recycling symbol on the bottom of most plastic containers. HDPE will be identified by a small 2 in the center of the recycling symbol, and will sometimes even be accompanied by HDPE written next to the symbol. When compared to ABS plastic: HDPE: density - .958g/cc.