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| a histidine-derived amine compound that is released mainly by damaged mast cells in allergic reactions, causing dilation and permeability of blood vessels and lowering blood pressure |
| a group of structurally different organs working together in the performance of a particular function; the digestive apparatus |
ostosis os·to·sis (ŏ-stō'sĭs)
n.
Variant of osteosis.