Table 3.

Stability of PSA substrates in various sera^a

		pmol of AMC released/min
Group	Sequenceb	Humanc	Mouse	Rat	Fetal calf	Calf	Goat
1	SRKSQQY	UD	3.52	0.52	0.98	1.05	0.36
	GQKGQHY	0.09	12.86	2.74	2.90	0.78	1.78
2	EHSSKLQ	UD	2.17	0.06	UD	UD	UD
	QNKISYQ	1.54	1.67	10.7	11.60	UD	5.54
	ENKISYQ	1.27	3.71	11.2	9.59	UD	3.18
	ATKSKQH	UD	0.60	4.31	1.19	UD	0.35
3	KGLSSQC	UD	0.66	0.80	0.03	UD	UD
	LGGSQQL	UD	13.92	0.17	1.10	UD	0.11
4	QNKQHYQ	0.24	9.57	7.03	4.53	UD	3.47
	TEERQLH	UD	10.71	0.66	0.02	UD	UD
2	HSSKLQ	UD	0.81	1.04	0.31	UD	UD
	SKLQ	UD	1.70	UD	0.21	0.02	ND

^aUD, undetectable (<0.01 pmol/min change); ND, not done.

^bEach substrate at 0.2 mm.

^c100% sera used for each assay.