1. Retinoids Run Rampant Neuron
Bruce Appel, Judith S Eisen 
Neuron 
Volume 40, Issue 3, Pages (October 2003)
DOI: /S (03)

2. Figure 1
Opposing RA and FGF Signaling Regulates Onset of Neurogenesis and Ventral Neural Patterning
Schematic represents a dorsal view of the caudal region of a developing chick embryo. Right side depicts early stages of neural development. Open circles are self-renewing stem cells, gray circles are neuroectodermal cells, and black circles are neurons. Red circles represent a putative clone, where descendents that occupy the stem zone remain together as the zone progresses posteriorly (arrows) and those that enter the transition zone are distributed along the RC axis (see Mathis et al., 2001). Onset of neurogenesis is coincident with somite formation. Left side depicts signaling interactions described in text.
Neuron  , DOI: ( /S (03) )

3. Figure 2 RA Signaling Regulates Many Phases of MN Differentiation
Neuron  , DOI: ( /S (03) )