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.
PVC is cheaper than ABS, is pressure-rated (pressure rated ABS is less available and far more expensive), and can be fused (glued) by solvent welding, whereas ABS can be only by ABS cement. August 6, 2013, 10:19pm. ABS is definitely the plastic of the 20th century. It outperforms many other plastics in many areas.