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an antigen preparation that stimulates the immune system to give protection against a particular disease or a group of diseases.
the region of the kidney where the renal artery enters, and where the renal vein and the ureter...
the form in which excess glucose is stored in the liver and muscles of mammals.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
the neurons that link motor and sensory neurons within the central nervous system.
those species that are found only in a particular area or region and nowhere else on Earth.