Table 2.

Effect of Pb exposure on trypsin protein content in mouse pup spleen^a

Sample	Blank Surface RUb	Trypsin Inhib. RU	Trypsin Inhib. minus Blank RU	Average RU
Control #1	119.3	204.9	85.6	92.2
	85.5	184.3	98.8
Control #2	78.3	149.7	71.4	73.2
	74.5	149.4	74.9
+Pb #1	123.3	321.4	198.1	198.1
	97.9	296	198.1
+Pb #2	88.9	299.1	210.2	206.2
	86.4	288.5	202.1

^aSpleen homogenates were prepared, as described in the methods (protease inhibitors present). Spleen homogenates were prepared separately from two control and two Pb exposed mice, each representative of a litter.

^bRU, response unit.