2.1.2.4	485762	A tetrahydro-folic acid linked formimino transfer enzyme	J. Am. Chem. Soc.	78	694-695	1956	Clostridium acidi-urici	-	
2.1.2.4	485761	Formation, isolation and properties of 5-formiminotetrahydrofolic acid	Fed. Proc.	16	236	1957	Clostridium cylindrosporum	-	
2.1.2.4	34311	Formimino-tetrahydrofolic acid and methenyltetrahydrofolic acid as intermediates in the formation of N10-formyltetrahydrofolic acid	J. Am. Chem. Soc.	78	5702-5704	1956	Clostridium cylindrosporum	-