cells of the body under a microscope. viruses in the body. research of stem cells. cellular therapy and regeneration

abstract background bacteria bacterium biological biology biotechnology blood body cell cells cellular chromosomes colony colorful cytoplasm disease egg embryo epidemic genetic germ germs health human illness illustration immune infection macro magnification medical membrane micro microbes microbiology microorganism microscope microscopic molecular nucleolus nucleus organism protein regeneration research science stem theme therapy treatment virus viruses