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Fig. 2 | BMC Biology

Fig. 2

From: The dorsoanterior brain of adult amphioxus shares similarities in expression profile and neuronal composition with the vertebrate telencephalon

Fig. 2

Expression of telencephalic genes in the adult brain of amphioxus. ad The expression of Bf1/FoxG1, eh EmxA, and il Lhx2/9, all shown in serial coronal paraffin sections from ventral to dorsal, with the ventricle of the cerebral vesicle (cv) centred in the images. In all cases, the anterior part of the brain is at the top of the image. FoxG1 expression extends throughout the ventral and lateral walls of the cv in adults (ad). EmxA (eh) is expressed in the dorsal three-quarters of the cerebral vesicle. Only EmxA reaches the top mantle of Joseph cells, indicated with arrows in g and h. Lhx2/9 expression (il) spans throughout the dorsal half of the cv with a dorsal limit just below the mantle of Joseph cells. mp summarises the expression of all the genes at the respective sections. All scale bars in amphioxus sections are 50μm. Arrowheads indicate the pigment of the frontal eye. Asterisks indicate the position of the infundibular organ. Arrows indicate the position of the Joseph cells. Double arrows indicate the pattern that is similar in Lhx2/9 to the summed expression of orthologous genes in the zebrafish hindbrain and reticulo-spinal neurons. Abbreviation: NP neuropore. Full series of sections are shown in Additional files 1, 2 and 4 Figures S1-S2 and S4

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