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Fig. 4. Immunoblot analysis of urea transporter (UT) protein expressed in the
kidney and urinary bladder of the marine toad. The affinity-purified
Bufo UT antibody recognized a single band of 52 kDa in extracts of
the kidney (lane 1) and urinary bladder (lane 2), but not of heart (lane 3)
and liver (lane 4) on negative control tissues. These bands disappeared after
preabsorption with the synthetic immunogen (kidney, lane 5; urinary bladder,
lane 6).