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The LLOQs for PBMC analysis were 2.5 picogram equivalents per microgram (pgEq/μg) DNA and 0.22 pgEq/μg RNA, and for BM analysis were 1.7 pgEq/μg DNA and 0.22 pgEq/μg RNA. A linear relationship (i.e., ∼10-fold) was established of radioactive dose from 14C-Aza 17 nCi/mouse to 188 nCi/mouse and AMS response (i.e., 14C/12C ratio ranging from 2.45 × 10-11 to 2.50 × 10-1, as Aza was incorporated into DNA in mouse BM. The current method enables the direct measurement of Aza incorporation into DNA and RNA from patient PBMCs and BM to provide do