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. 2009 Mar;214(3):330–338. doi: 10.1111/j.1469-7580.2008.01038.x

Table 2.

Summary of the cell types with positive staining for peptidergic and monoaninergic neuronal makers and their intensity

Positive cell types
Markers Leydig cells Spermatogonia Myoid cells
PGP 9.5 +++ ++
NPY ++ ++
CPON ++ ++
VIP ++
DBH ++
5-HT ++

The relative intensity of each neuronal marker in certain cell types is recorded using the following scoring system: −, no staining; +, weak staining; ++, moderate staining; +++, intense staining.