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* Abbreviations for members ofthe folic acidgroup, based on PtG for pteroylglutamate: H4PtG, tetrahydropteroylmonoglutamate; H4PtG3, tetrahydropteroyltriglutamate; derivatives of these compounds are indicated as, e.g., N5-methyl-H4PtG.

566K. SELBY 1961 3. These comparisons suggest that the enzyme, being composed of large molecules with restricted mobility in the substrate, removes a number of adjacent glucose residues from each of relatively few sites of attack.A portion of this research was conducted under a project authorized by U.S. Public Law no. 480, 83rd Congress.