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We have investigated the expression patterns of two Xenopus laevis genes with similarity to mouse steel (sl) using whole-mount in situ hybridization. Areas of overlapping expression include the epidermis, stomodeum, proctodeum, and otic placodes. Xsl-1 is specifically expressed in the pronephros, neural tube, gil arches, and a superficial region of the somite, while Xsl-2 is in the ganglion and facial nerve projecting to visceral arch 3, the mandibular arch, and the clefts of anteriorsomites. Thus, both transcripts exhibit partially overlapping expression patterns, but their tissue distribution differs significantly from that of sl expression in the mouse and chicken.
Fig. 2. Expression of Xsl-1 RNA. All embryos are pictured with the anterior to the left unless otherwise noted (B,E,K). Stages 12 (A–C) and 17 (D–E) are shown from dorsal views (A,D), frontal views (B,E), where dorsal is to the top of the frame, and as saggital sections (C,F). Stages 24 (G), 28 (H), 33 (I,L,M), and 37 (J,N) are shown as lateral views. Panel K is a transverse section of a stage 37 embryo at approximately the level of fourth trunksomite. High magnification views of a cleared stage 33 embryo are pictured in L (anterior) and M (posterior). A high magnification view of expression in the pronephros, somites, and neural tube of a cleared stage 37 embryo is seen in N. Further description of the arrows and arrowheads can be found in Section 1.
Fig. 3. Expression of Xsl-2 RNA. Stage 17 (A) is shown from a frontal view with dorsal to the top, while stages 24 (B), 28 (C), 33(D,H,I), and 37 (E) are shown from a lateral view. Panels F and G are transverse sections of a stage 37 embryo at the level of the otic placode (F) and approximately the fourth trunksomite. High magnification views of a cleared stage 33 embryo are pictured in H (anterior) and I (posterior). Further description of the arrows and arrowheads can be found in Section 1.
