Observation:Prid:Pt:Tiss:Nom:Phosphotungstic acid hematoxyl
observation:prid:pt:tiss:nom:phosphotungstic acid hematoxyl
Observation:Prid:Pt:Tiss:Nom:Phosphotungstic acid hematoxyl
observation:prid:pt:tiss:nom:phosphotungstic acid hematoxyl