Table 1.

Staining characteristics of normal tissues obtained at autopsy

Tissue	Staining characteristics
Neurons (all CNS populations)	–
Astrocytes (including Bergmann glia)	Majority –, occasional scattered +
Oligodendrocytes	Majority –, occasional scattered +
Ependymocytes	++
Choroid plexus epithelium	++
Microglia and macrophages	++
Arachnoid membrane	++
Adenohypophysis	++
Neurohypophysis	Weak +
Pineocytes	–
Fibroblasts (choroid plexus stroma)	++
Vascular endothelium	++
Vascular smooth muscle	++

Symbols used: –, negative for PTB; +, positive for PTB; ++, strongly positive for PTB.