Inhibition of extracellular Ca 2+ entry by YC-1, an activator of soluble guanylyl cyclase, through a cyclic GMP-independent pathway in rat neutrophils 1 1Abbreviations: CO, carbon monoxide; CPA, cyclopiazonic acid; fMLP, formyl-methionyl-leucyl-phenylalanine; HBSS, Hanks’ balanced salt solution; IP3, inositol 1,4,5-trisphosphate; NO, nitric oxide; PKC, protein kinase C; PKG, cyclic GMP-dependent protein kinase; PLC, phospholipase C; PMA, phorbol 12-myristate 13-acetate; Rp-8-pCPT-cGMPS, 8-(4-chlorophenylthio)guanosine-3′,5′-monophosphorothioate, Rp-isomer; sGC, soluble guanylyl cyclase; and SNP, sodium nitroprusside.