div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Molecular Sieving by Cell Membranes of Bacillus megaterium src=https:reader038fdocumentsusreader038viewer20221004215750682a1a28ab0f07aee8b0html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1964 Nature Publishing Grouppdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: Molecular Sieving by Cell Membranes of Bacillus megaterium src=https:reader038fdocumentsusreader038viewer20221004215750682a1a28ab0f07aee8b0html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divp© 1964 Nature Publishing Grouppdiv