on day 5 , they were challenged with 20 microliters of 0.2 % dnfb on each left ear , and on day 33 challenged again with either painting 20 microliters of 0.2 % dnfb on their both ears or intravenous administration of 15 mg of dinitrobenzene sulphonic acid ( dnbs ) .
C0012463
dnfb
C0012459
dinitrobenzene