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.
Description. Thick and durable 25-pt. pressboard made from earth-wise 100% total recycled material. 1  Fasteners can hold 2-thick stacks of paperwork securely inside the folder for instant flip-through. 2  Classification folders help you subdivide and identify various sections of your documentation.