div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Inhibited Incorporation of Ammonium Chloride labelled with Nitrogen-15 in Chick Embryos treated with β-Aminopropionitrile src=https:reader031fdocumentorgreader031viewer2022020523575068211a28ab0f07aebdb0html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1962 Nature Publishing Grouppdiv