Fig. 3. Pigeons (filled bars) had significantly greater clearance (µl min^–1 cm^–1) of L-arabinose and L-rhamnose than rats (open bars) in loops of intestine. Duodenal clearance (µl min^–1 cm^–1) of larger probes (cellobiose: M_r=342.3; raffinose: M_r=594.5) was relatively low for both pigeons (filled bars) and rats (open bars). Raffinose clearance was negligible. Values are means ± s.e.m. (N=5–6 rats, 6 pigeons). See text for statistical comparisons.