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active during the day.
an abnormal response of the immune system to the protein in certain foods.
the inner region of the kidney, striped in appearance, made up of renal pyramids.
(also called primary meristems) meristems at the apex (tip) of stems and roots where primary...
simple epithelium with elongated, cells that lines the stomach, small intestine, urethra, vas...
process by which cells become specialised to perform a specific function.