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Fig. 4. Different populations of Fgfr3+ and
Pdgfra+ cells in the newborn spinal cord. We hybridised
sections of P2 mouse cervical spinal cord simultaneously with a DIG-labelled
Fgfr3 probe together with an FITC-labelled Pdgfra probe to
visualise OLPs. The Fgfr3 signal (red) was visualised with
rhodamine-tyramide reagent and the Pdgfra signal (green) with
fluorescein-tyramide. Scattered individual Fgfr3+ and
Pdgfra+ cells can be seen throughout both white and grey
matter of the cord, but these are separate and discrete cell populations. We
conclude that the great majority of Fgfr3+ cells in the
cord are not OLPs.