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science microbiology cell biology production cephalosporin antibiotoics zoology economically fish cilliates microorganism microscopic protozoan paramecium mycobacterium tuberculosis mutation crossing over genetics gene expression analysis transcriptomic reproduction cell division staining chemistry histology mpn technique contamination faecal multiple tube fermentation mpn oral hsv genital hsv neonatal hsv ds dna virus two main types most dreadful pathogenic herpes simplex virus hsv poly a tail enzyme exact sequence retrival from the online cdna libraries gene probes expressing the protein exons virus reverse transcriptase mrna cdna bioreactor bactericidal tetracyclin immunology