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an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
an antigen preparation that stimulates the immune system to give protection against a particular...
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...
a leaf with certain areas that lack chlorophyll. The leaf therefore contains both green and non-...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.