Cell membrane proteins that bind opioids and trigger intracellular changes which influence the behavior of cells. The endogenous ligands for opioid receptors in mammals include three families of peptides, the enkephalins, endorphins, and dynorphins. The receptor classes include mu, delta, and kappa receptors. Sigma receptors bind several psychoactive substances, including certain opioids, but their endogenous ligands are not known
Opie, Amelia, 1769-1853. : Amelia : the tale of a plain Friend : by Jacobine Menzies Wilson and Helen Lloyd
1937
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Opie, Amelia, 1769-1853. Adeline Mowbray : The female philosopher and her afterlives : Mary Wollstonecraft, the British novel, and the transformations of feminism, 1796-1811 / Deborah Weiss
Opie, Peter., 1918-1982 : Children and their books : a celebration of the work of Iona and Peter Opie / edited by Gillian Avery and Julia Briggs ; with a foreword by Iona Opie
1989
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Opie, Roy, 1909-1968 : Roy Opie, 1909-1968 : a retrospective exhibition of paintings and drawings / [compiled by Margaret Rich]
1979
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Opie, Roy, 1909-1968 -- Exhibitions : Roy Opie, 1909-1968 : a retrospective exhibition of paintings and drawings / [compiled by Margaret Rich]
Opinião pública (relações públicas) : Democratic challenges, democratic choices : the erosion of political support in advanced industrial democracies / Russell J. Dalton
An enduring, learned predisposition to behave in a consistent way toward a given class of objects, or a persistent mental and/or neural state of readiness to react to a certain class of objects, not as they are but as they are conceived to be
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Opinion : Paradigm Shift : How Expert Opinions Keep Changing on Life, the Universe, and Everything