[biological_process] cellular response to ionizing radiation <sep> cellular response to organic cyclic compound <sep> cellular response to oxidative stress <sep> DNA alkylation repair <sep> DNA damage response <sep> DNA repair <sep> mammary gland epithelial cell differentiation <sep> methylation <sep> negative regulation of apoptotic process <sep> positive regulation of DNA repair <sep> positive regulation of double-strand break repair <sep> response to ethanol <sep> response to folic acid <sep> response to organic cyclic compound <sep> response to toxic substance <sep> response to xenobiotic stimulus