TABLE 3.

Glycine auxotrophy in the absence of SHMT

		Steady-state velocities
SHMT	Amino acids	Thymidylate	GDC	Formate export synthase from mitochondria
	% of Normal
Present	Normal	100	100	100
Absent	Normal	96	98	99
Absent	No serine	115	108	98
Absent	No glycine	59	1	29