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Post- marketing surveillance Good manufacturing practices About books — for more than 40 years and throgh the three previous edition first edition , second edition , Third edition About the author Roop K. Faridabad Nell and former dean and head departments of pharmacy jamia humdard new Delhi , He is the Executive director and founder of pharmulators concept LID providing Consultancy service to the pharmaceutical industries and eductional institutions. He has contributed more than publication with a cumulative impact factor of and citations.
Main article: Transcription biology The production of a RNA copy from a DNA strand is called transcription , and is performed by RNA polymerase s, which add one ribo nucleotide at a time to a growing RNA strand as per the complementarity law of the nucleotide bases. In eukaryotes, transcription is performed in the nucleus by three types of RNA polymerases, each of which needs a special DNA sequence called the promoter and a set of DNA-binding proteins— transcription factors —to initiate the process see regulation of transcription below. Transcription ends when the polymerase encounters a sequence called the terminator.