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histology medicine maha hammady cell biology transmission electron microscopy templates mdna aging mitochodria adipose tissue cell cycle cell kidney hands only basic life support cardiac compression cpr cardiac hands only cpr gyn alexandria scleroderma rheumatology systemic sclerosis ectopic pregnancy pregnancy extrautrine obst placental insufficiency villous structure placental maturation maternal-fetal exchange syncytial knots chorionic villi syncytiotrophoblast cytotrophoblast placental histology placenta intermediate filaments microfilaments microtubules myosin actin cytoskeleton oral cavity repair cns stem cells hepatocyte lymphatic pathway perisinusoidal space space of disse (perisinusoida hepatic sinusoids the portal tract classical hepatic lobule mitochondria