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n. a tissue or organ obtained from one member of a species and grafted to a genetically dissimilar member of the same species. (a_____)

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n. a tissue graft or organ transplantation from a donor of different species from the recipient. (x_______)

n. the transparent layer which covers and protects the outer part of the eye. (c______)

adj. located towards the center of the body or near to point of attachment or origin. (p______)

n. either of two bean-shaped organs that filter wastes (especially urea) from the blood and excrete them and water in urine. (k_____)