Observation:Prid:Pt:Tiss:Nom:Trichrome stain.Masson modified
observation:prid:pt:tiss:nom:trichrome stain.masson modified
Observation:Prid:Pt:Tiss:Nom:Trichrome stain.Masson modified
observation:prid:pt:tiss:nom:trichrome stain.masson modified