Figure 5From: Replication of avian, human and swine influenza viruses in porcine respiratory explants and association with sialic acid distributionComparison of binding with digoxigenin-conjugated MAA in paraffin sections (A) and cryosections (B) of the porcine trachea. Only the cryosections showed clear positivity in the glands (black arrows) and the small blood vessels (blue arrows), while paraffin sections were completely negative.Back to article page