Observation:Prid:Pt:Tiss:Nom:Mallory-Heidenhain stain
observation:prid:pt:tiss:nom:mallory-heidenhain stain
Observation:Prid:Pt:Tiss:Nom:Mallory-Heidenhain stain
observation:prid:pt:tiss:nom:mallory-heidenhain stain