AntimetabolitesHydroxyureaAntimetabolites, AntineoplasticFloxuridineTetrahydrouridineAntisickling AgentsTrabeculectomyInosine MonophosphatePhosphoribosyl PyrophosphateFluorouracilCytarabineLeukemia L1210MethotrexateMitomycin6-MercaptopurineFolic Acid AntagonistsPurinesAntineoplastic AgentsAnemia, Sickle CellDrug SynergismFetal HemoglobinCell SurvivalDeoxycytidineCell CycleDrug Screening Assays, AntitumorNucleic Acid Synthesis InhibitorsRibonucleotide ReductasesDrug Evaluation, PreclinicalCell DivisionTumor Cells, CulturedNeoplasmsCell LineKineticsDNA ReplicationPolycythemia VeraPipobromanS PhaseGuanazoleThrombocythemia, EssentialAphidicolinThymidineDNA Damage