Figure 6. Comparison of gene expression patterns in a generic vertebrate and amphioxus brains. In light blue the new molecular regionalization of amphioxus brain as described by Albuixech-Crespo et al. (2017) (HyPTh, hypothalamo–prethalamic primordium; DiMes, Diencephalic-Mesencephalic primordium, corresponding to the region of the thalamus, pretectum, and midbrain of vertebrates, RhSp. Rhombencephalo-Spinal primordium).