blood pb concentrations on d 21 were ( mean +/- se ) 23 +/- 3 ( control ) , 63 +/- 19 , 246 +/- 55 , and 994 +/- 223 microgram/100 ml , and brain pb concentrations were 14 +/- 2 , 60 +/- 5 , 114 +/- 15 , and 275 +/- 26 microgram/100 g , respectively .
C0006104
brain
C0086045
concentrations