Fig. 1
From: FGF- and SHH-based molecular signals regulate barbel and craniofacial development in catfish
Maxillary barbel and Craniofacial development of Amur catfish. a Lateral view of Amur catfish. b Schematic drawing of the maxillary barbel. This structure is composed of taste buds, blood vessels (not shown), cartilages, muscles, and peripheral nerves. The peripheral nerves include the anterior complex rami of trigeminal and facial nerves and posterior ramus of the facial nerve. Anterior is left and the proximal side is the upper side. Catfish embryos at 1 dpf (c, g, k), 2 dpf (d, h, l), 3 dpf (e, i, m), and 4 dpf (f, j, n) observed using optical macroscopy. Lateral views are shown in c–f and k–n. Ventral views are shown in g–j. amdb, anterior mandibular barbel; mxb, maxillary barbel; pmdb, posterior mandibular barbel. Scale bars in c–j, m, n are 500 μm, and 200 μm in i, j