IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-11-7-42742 Original Research Paper Phenotypic analysis of differentiated HL-60 Cells for use in Streptococcus pneumoniae Opsonophagocytic-Killing Assay Manjula Subbanna Dr. Dr. Geetha Nagaraj Dr. July 2022 11 7 01 02