div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader040vdocumentsusreader040viewer2022020523575068571a28ab0f07afb9a9html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Sodium nitroprusside and other smooth muscle-relaxants increase cyclic GMP levels in rat ductus deferens src=https:reader040vdocumentsusreader040viewer2022020523575068571a28ab0f07afb9a9html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1977pdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader040vdocumentsusreader040viewer2022020523575068571a28ab0f07afb9a9html5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: Sodium nitroprusside and other smooth muscle-relaxants increase cyclic GMP levels in rat ductus deferens src=https:reader040vdocumentsusreader040viewer2022020523575068571a28ab0f07afb9a9html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© Nature Publishing Group1977pdiv