Fig. 1. Different models explaining how NSCs in the pMN domain might generate
differentiated cell types. (A) NRP/GRP model. (B) MNOP
model. (C) Sequential model. Ast, astrocyte; MN, motoneuron; MNOP,
motoneuron and oligodendrocyte common progenitor; N, neuron; NA, neuron and
astrocyte common progenitor; OPC, oligodendroctye precursor; O,
oligodendrocyte; pA, astrocyte precursor; pM, motoneuron precursor.
Olig+ cells are orange; NSCs at different stages in the sequential
model are coded in different colors to reflect restrictions in competence.