Table 3. Determination of binding of SU/anti-V3 antibodies by ELISA, in the presence or absence of heparin.

Antibodies	PPR		PPRcr		C36		34TF10
	-	+	-	+	-	+	-	+
SU1-5	100.0	108.4	2.4	−0.4	5.9	6.9	1.3	−4.4
SU1-7	100.0	98.9	91.0	85.7	34.7	33.9	80.9	67.8
SU1-10	100.0	94.4	1.2	0.0	5.7	6.4	2.2	−0.5
SU1-30	100.0	98.0	94.1	79.7	65.2	66.6	80.5	68.7
SU2-4	100.0	100.5	96.1	90.8	88.0	84.0	94.6	83.2
SU2-5	100.0	96.9	96.9	85.6	84.7	83.2	92.4	82.1
SU2-10	100.0	100.1	76.9	64.7	64.9	57.5	41.6	31.6

Binding of FIV SU-Fc to anti-V3 antibodies detected by ELISA as described in “Materials and Methods”. Anti-V3 mAbs were incubated with SU-Fc for 1 h in the presence or absence of heparin at room temperature. Values for other SUs-Fc are percentages of the mean optical density value of PPR SU-Fc, which is regarded as 100%. Results represent one of three independent experiments. Values in bold represent loss of specific antibody reactivity to a given SU-Fc.