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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 outermost layer of the plant cell wall that forms the contact surface between adjacent plant...
the field of study that provides scientific names for organisms, describes them, preserves...
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
a sudden severe instance of abnormal heart function accompanied by chest pains and possible...