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・ Sigma Phi Delta
・ Sigma Phi Epsilon
・ Sigma Phi Epsilon Literary Society
・ Sigma Phi Lambda
・ Sigma Phi Omega
・ Sigma Phi Rho
・ Sigma Pi
・ Sigma Pi (literary society)
・ Sigma Pi Alpha
・ Sigma Pi Phi
・ Sigma Pi Sigma
・ Sigma Piscium
・ Sigma Protocol
・ Sigma Psi Zeta
・ Sigma Puppis
Sigma receptor
・ Sigma SA-mount
・ Sigma Sagittarii
・ Sigma Scorpii
・ Sigma Sculptoris
・ Sigma SD1
・ Sigma SD10
・ Sigma SD14
・ Sigma SD15
・ Sigma SD9
・ Sigma Serpentis
・ Sigma Seven
・ Sigma Sigma Omicron
・ Sigma Sigma Phi
・ Sigma Sigma Rho


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Sigma receptor : ウィキペディア英語版
Sigma receptor

The sigma receptors σ1 and σ2 bind to ligands such as 4-PPBP, SA 4503, ditolylguanidine, dimethyltryptamine and siramesine.
== Classification ==
σ–receptors were once thought to be a type of opioid receptor, because the d- stereoisomers of the benzomorphan class of opioid drugs reduced coughing, as do some other opioid derivatives such as dextromethorphan. However, such drugs had no clinically relevant affinities for μ (Mu), κ (kappa), or δ (Delta) receptors.
However, pharmacological testing indicated that the σ-receptors ''were'' activated by drugs completely unrelated to the opioids, and their function was unrelated to the function of the opioid receptors. For example, phencyclidine (PCP), and the antipsychotic haloperidol may interact with σ-receptors. Neither phencyclidine nor haloperidol have any appreciable chemical similarity to the opioids.
When the σ1 receptor was isolated and cloned, it was found to have no structural similarity to the opioid receptors. At this point, they were designated as a separate class of receptors.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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