2 -Deoxycytidine hydrochloride (CAS No 3992-42-5) is a nucleoside analog used in biochemical research primarily related to DNA synthesis and repair mechanisms Originating from modifications of naturally occurring cytidine it functions by incorporating into DNA strands thereby influencing cellular replication and repair pathways In vitro it demonstrates activity generally within the nanomolar to low micromolar range indicating potent interaction with target enzymes involved in nucleic acid metabolism It is commonly applied in studies using various cell models to investigate cancer cell proliferation cellular responses to DNA damage and potential therapeutic interventions Additionally it serves as a tool in drug screening assays to explore the efficacy of chemotherapeutic agents Experimental concentrations typically depend on the specific research design allowing flexibility and specificity in varied experimental setups