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.
ABS chairs are meant to be much more expensive than polypropylene chairs whereas the overall strength of ABS steals a march over polypropylene. ABS has a tensile strength of about 5500 psi, while polypropylene has a tensile strength of about 4000 psi. ABS is also comparatively harder and lighter. So it's fairly obvious that ABS is the stronger material out of the two.