title: Two effects of phosphodiesterase inhibitors on Limulus ventral photoreceptors.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology*; D000818:Animals; D006737:Horseshoe Crabs; D008564:Membrane Potentials / Q000187:drug effects; D010208:Papaverine / Q000494:pharmacology*; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000187:drug effects*; D013806:Theophylline / Q000031:analogs & derivatives* / Q000494:pharmacology*
chemical_list: D013806:Theophylline; D010208:Papaverine; D015056:1-Methyl-3-isobutylxanthine