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Fig. 1. Typical immunohistochemical staining in gill epithelia. (A)
Macrophthalmus abbreviatus; red deposits represent a cytoplasmic HA
distribution. (B) Macrophthalmus abbreviatus; negative control. (C)
Eriocheir sinensis; red deposits represent an apical HA distribution.
(D) Eriocheir sinensis; negative control. A, apical region. C,
cytoplasm. cu, cuticle. n, nucleus. p, pillar cell. se, septum. Bars, 20
µm.