Software for "A Mathematical Model for the Mating-Induced 
    Prolactin Rhythm of Female Rats", American Journal of Physiology, 
    vol. 290, pp. E573-E582, 2006, by R. Bertram, M. Egli, N. Toporikova,
    and M. E. Freeman  
    
      - First three figures, with prolactin, dopamine, and VIP 
       interactions only. 
       Figures 1-3 
  
      - Direct stimulatory action of oxytocin on lactotrophs.
      Figures 4-5 
 
      - Oxytocin action on both lactotrophs and bistable interneurons.
      Figure 7 
 
      - Terminating factor directly inhibits lactotrophs.
      Figure 8 
 
      - Terminating factor inhibits lactotrophs by stimulating DA neurons.
      Figure 9