The Opioid and Sigma Ligands Plate contains 74 ligands including endogenous neurotransmitters, agonists, antagonists, and marketed drugs.

The library is ideal for screening or identifying recombinant orphan G protein coupled receptors, target validation, secondary screening, assay development, and other pharmacological applications. The Opioid and Sigma Ligands plate is 1 plate of the larger Neurotransmitter Library which contains over 650 ligands.