... Autumnalchanges in total nitrogen, salt-extractable pro-teins and amino acids in leaves and adjacent xylem and phloem) required for efficient nitrogen transport. In contrast, arginine, ... of amino compounds found in xylem, only the amides, asparagine and glutamine; the amino acids, glutamate,aspartate, arginine and proline; and theureides, allantoin, allantoic ... from ginkgo bark (Shim and Titus, 1985) have begun to charac-terize these storage proteins. These pro-teins are rich in arginine and other basicamino acids (Kang and Titus,...