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Arion vulgaris, lectin affinity tests. (a) The secretory material of one or more gland types of the ventral area shows a strong affinity for α‐L‐fucose (lectin UEA II) (white arrows), while the remaining epithelium lacks a clear reaction to this sugar moiety. (b) Also, the isolated ventral mucus reacts positively to α‐L‐fucose (lectin UEA II) only. Scale bar in a and b = 50 μm
