pcr and its application pcr working mechanism polymerase chain reaction pcr polycythemia vera yepda agar starch agar emb eosin methylene blue macconkey agar mannitol salt agar chocolate agar blood agar potato dextrose agar pda nutrient agar differential media selective media media preparation urease test hydrogen sulphide test oxidase test catalase test citrate utilization voges proskauer methyl red test indole biochemical test imvic
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