An adenylate cyclase that is activated specifically by very low concentrations of octopamine has been identified both in homogenates and in intact cells of the thoracic ganglia of an insect nervous system. (science.sciencemag.org)
However, researchers have long thought that tumors don't release intact cells into the bloodstream until relatively late in the disease, and then only in vanishingly small numbers. (sciencemag.org)
Cyclic adenosine monophosphate (cAMP)- dependent protein kinase, labeled with fluorescein and rhodamine on the catalytic and regulatory subunits, respectively, was injected into Aplysia sensory neurons either in culture or in intact cell clusters. (science.sciencemag.org)