MeristemGene Expression Regulation, PlantFrozen SectionsParaffin EmbeddingTissue FixationFormaldehydeTissue BanksFreezingFixativesTissue PreservationParaffinImmunoenzyme TechniquesMicrotomyImmunohistochemistrySpecimen HandlingCryopreservationMicrodissectionAntibodies, MonoclonalStaining and LabelingAntigens, NeoplasmFluorescent Antibody TechniquePalatine TonsilTumor Markers, BiologicalGene Expression ProfilingReverse Transcriptase Polymerase Chain ReactionPolymerase Chain ReactionDNA, NeoplasmHistocytochemistryOligonucleotide Array Sequence AnalysisReproducibility of ResultsLasers