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Fig. 5. Pressure changes (Pa) that develop in the brachial lymphatic sac during
expiration in C. marinus and L. catesbeiana (means ±
s.e.m.) compared with the estimated range of 0.5–1.0 cm (50–100
Pa; shaded box) of gravitational pressure necessary to raise lymph to the
subvertebral lymph sac. Values were not different between the two species
(P>0.05).