AntimetabolitesAntimetabolites, AntineoplasticTetrahydrouridineFloxuridineTrabeculectomyInosine MonophosphatePhosphoribosyl PyrophosphateFluorouracilMitomycin6-MercaptopurineMethotrexateLeukemia L1210Folic Acid AntagonistsCytarabinePurinesAntineoplastic AgentsDrug SynergismMicroscopy, ElectronCell SurvivalDrug Screening Assays, AntitumorDeoxycytidineDrug Evaluation, PreclinicalCell LineCell DivisionOsteocytesTumor Cells, CulturedNeoplasmsCell CycleSchwann CellsNeurogliaRetinaRetinal Horizontal CellsAxonsMicroscopy, ConfocalAmacrine CellsKineticsCells, CulturedIntercellular JunctionsImmunohistochemistryActinsNeuronsMicroscopy, Electron, ScanningCell CommunicationFluorescent Antibody Technique, Indirect