Table 1.

Serum ACE levels of different genotypes of ACE (29, 31).

Serum ACE level	Genotypes
	II	ID	DD
Normal	9.0–12.5	10.5–17.1	11.9–22.5	IU/L†
	3.76–11.25	5.22–11.59	7.19–14.84	U/L‡
Sarcoidosis	13.5–29.3	16.7–31.1	19.8–34.8	IU/L†

ACE, Angiotensin-converting enzyme.

†Serum ACE level was measured by a colorimetric method using p-hydroxyhippuryl-l-histidyl-l-leucine as the substrate.

‡Optimized Serum ACE level was measured by internally quenched fluorescent substrate, Abz-FRK(Dnp)P-OH.