div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader042vdocumentsusreader042viewer2022021402575068191a28ab0f07ae9770html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Antibodies blocking Neutralization of Penicillinase by the Homologous Antiserum src=https:reader042vdocumentsusreader042viewer2022021402575068191a28ab0f07ae9770html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1961 Nature Publishing Grouppdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader042vdocumentsusreader042viewer2022021402575068191a28ab0f07ae9770html5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: Antibodies blocking Neutralization of Penicillinase by the Homologous Antiserum src=https:reader042vdocumentsusreader042viewer2022021402575068191a28ab0f07ae9770html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1961 Nature Publishing Grouppdiv