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cell biology chromosomes nucleus membrane organelle cytoplasm microscope science medicine health genetics DNA RNA protein nucleic acid amino acid base pair gene chromosome karyotype genome proteome cell cycle mitosis meiosis fertilization embryo fetus zygote blastocyst morula totipotent pluripotent differentiated stem cell progenitor cell precursor cell terminally differentiated cell apoptosis necrosis oncosis autophagy cell death cellular senescence aging