Cell surface proteins that bind acetylcholine with high affinity and trigger intracellular changes influencing the behavior of cells. Cholinergic receptors are divided into two major classes, muscarinic and nicotinic, based originally on their affinity for nicotine and muscarine. Each group is further subdivided based on pharmacology, location, mode of action, and/or molecular biology
Specific loci that show up during KARYOTYPING as a gap (an uncondensed stretch in closer views) on a CHROMATID arm after culturing cells under specific conditions. These sites are associated with an increase in CHROMOSOME FRAGILITY. They are classified as common or rare, and by the specific culture conditions under which they develop. Fragile site loci are named by the letters "FRA" followed by a designation for the specific chromosome, and a letter which refers to which fragile site of that chromosome (e.g. FRAXA refers to fragile site A on the X chromosome. It is a rare, folic acid-sensitive fragile site associated with FRAGILE X SYNDROME.)
Sites -- Excavations. : Islands of inquiry : colonisation, seafaring and the archaeology of maritime landscapes / edited by Geoffrey Clark, Foss Leach and Sue O'Connor
Sites - Stone arrangements. : Yiwara : foragers of the Australian desert / Richard A. Gould, illustrated with photographs by the author ; and drawings by Nicholas Amorosi
--names of individual Web sites and subdivision Computer network resources under subjects
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Sites Web -- Classement -- Informatique. : Soft computing in Web information retrieval : models and applications / Enrique Herrera-Viedma, Gabriella Pasi, Fabio Crestani (eds.)
Siþs, Peter, 1949- : Something about the author. Volume 149 : facts and pictures about authors and illustrators of books for young people / Lisa Kumar, project editor