The Proof by <sup>13</sup>C‐NMR Spectroscopy of the Predominance of the C<sub>5</sub> Pathway over the Shemin Pathway in Chlorophyll Biosynthesis in Higher Plants and of the Formation of the Methyl Ester Group of Chlorophyll from Glycine
The 13 C‐NMR spectrum of chlorophyll a formed when excised etiolated maize leaves were greened in the presence of [1‐ 13 C]glutamate showed that the four methine bridge carbons ...