Creature type (Dungeons & Dragons) animals despite their real-world bases being more closely related to vermin type creatures. Creatures deemed inconsequential by DMs or designers are not given any creature type at all, instead being treated as "set dressing" unless a specific game effect targets such non-creatures. Examples include actual-sized spiders, sparrows, fleas, worms, shellfish, and mice. "Swarm" type creatures are occasionally written to represent such otherwise nonthreatening creatures if they were to group together by some force of magic within the game world. Under the rules of D&D, animal type creatures do not have an Intelligence score higher than 2. When a designer makes
History of catecholamine research characteristically and specifically differs from those of the two other catecholamines″. A re-investigation of the blood pressure-lowering effect in dogs in 1964 proposed ″specific dopamine receptors for dilation″, and at the same time evidence for dopamine receptors distinct from α- and β-adrenoceptors accrued from other experimental approaches. In 1986, the first gene coding for a catecholamine receptor, the β-adrenoceptor from hamster lung, was cloned by a group of sixteen scientists, among them Robert Lefkowitz and Brian Kobilka of Duke University in Durham, North Carolina. Genes for all mammalian catecholamine receptors have now been cloned, for the nine adrenoceptors α, α,