Table 2.

CA specific activity of affinity-pure, secretory form of wild type and mutant at residue 63 for bovine, rabbit, and murine CA IVs transfected with pCAGGS and cDNA insert in COS-7 cells, and of affinity-pure CA IVs isolated from the lung tissues

Enzyme	EU/mg of pure CA IV
	From cDNAs in COS-7 cells	From lung tissues
Bovine CA IV, wild type	3024	2300
Bovine CA IV, Gly-63 → Gln	634
Rabbit CA IV, wild type	2495	2200
Rabbit CA IV, Gly-63 → Gln	520
Murine CA IV, wild type	436	350
Murine CA IV, Gln-63 → Gly	2200