TY - RPRT TI - Density differences between genetic markers in Pneumococcal transforming principle. AU - R ROLFE AU - H EPHRUSSI-TAYLOR PY - 1961 DO - 10.1073/pnas.47.9.1450 UR - https://pubmed.ncbi.nlm.nih.gov/13742932/ ID - 13742932 ER -