properties classes of stem cells embryonic stem cells (esc) adult stem cells (asc c stem cell properties importance of vaccines problems in development adjuvants vaccines artificial immunization immunity-natural community succession niche concept community characteristics biocoenosis biotic community biological thermodynamics laws of conservation and degradation of energy human biorhythms chronobiology circadian rhythms biorhthythms significance water molecule structure molecular events muscle physiology stimulus resting potential action potential nerve impulse enzyme kinetics -models enzyme chemistry climate change greenhouse gas global warming enzyme tools genetic engineering recombinant dna technology
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