The present invention relates to the use of regulatory sequences for mediating specific, early transient expression in proliverative neuronal determined cells. Furthermore, the uses of recombinant nucleic acid molecules comprising said defined regulatory sequences for mediating specific, early transient expression in proliverative neuronal determined cells as well as for the generation of non-human transgenic organisms and/or host cells are disclosed. In addition, the invention provides for transgenic non-human animals and/or host cells comprising said regulatory sequences and/or recombinant nucleic acid molecules. The invention also describes methods for the preparation of such vectors, host cells and transgenic nonhuman animals as well as methods for the detection and/or isolation of neuronal determined cells. Additionally, methods for screening of compounds capable of regulating neuronal determined cell activity, neurogenesis, stimulating proliferation of neuronally committed precursor cells and/or neuronal differentiation are provided and the invention also relates to methods for the detection and analysis of neuronal differentiation, neuronal migration and/or neuronal determination processes. Finally, the invention relates to diagnostic and pharmaceutical compositions comprising the regulatory sequences, recombinant nucleic acid molecules, host-cells or isolated neuronal determined cells described herein.