Case pg322, fig2. Soma notes each major nucleus or area of hypothalamus reliably contained at least a few retrogradely labeled cells, with the exception of the median & magnocellular preoptic nuclei, supraoptic nucleus & suprachiasmatic nucleus.. Terminal notes 9 implants of true blue were centred in the MPN? tracer dep more discrete & concentrated than those from pressure inj of TB suspensions; each implant involved majority of MPN & rarely adjacent structures. Could have uptake by Fibres of Pass..