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PTPγ expression in the pMN domain. Enlarged images are shown of the motor neuron progenitor region (pMN) of HH20 (A, B) and HH22 (C, D) embryos shown in Fig. 1L and R, respectively. Left hand panels (A and C) show weak but visible in situ signal for PTPγ mRNA in the ventricular region of the pMN (square brackets) either side of the midline (dashed line), compared to the right hand panels (B and D) that show neighbouring connective tissue, which is devoid of signal.
