Fig. 5.

Spatial-temporal overview of anaplastic lymphoma kinase (Alk) mRNA expression in developing chick nervous system. A: Spatial schematic of Alk expression (shading) with emphasis on location of transcript during investigated time points. B: Temporal schematic of Alk expression (bars) with emphasis on span of transcript duration in the embryonic PNS and spinal cord. Solid bar ends denote the definitive identification of a start point regarding Alk expression. Diffuse bar ends denote that a definitive start or end point was not identified from the time points analyzed in this investigation. Depth of shading within the bars is a reflection of the intensity of Alk expression. SC, spinal cord; MMC, medial motor column; LMC, lateral motor column; DRG, dorsal root ganglia; SG, sympathetic ganglia.