the release of sp , as measured by radioimmunoassay ( ria ) , was characterized in terms of its dependence on extracellular calcium ion , its stimulus-response relationship , its sensitivity to the calcium-channel blocker omega conus toxin ( omega-cgtx ) , and its modulation by the dhps bay k 8644 and nifedipine .
C0012315
dhps
C0028066
nifedipine