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action alive animals antibiotics antigenic arteries become behaviour blood transfusion body bone brain stem cancer cerebral cerebral cortex chemical child chromosomes circumstances clinical concept consciousness consequence cord coronary cortex cortisone depends diagnosis difficult doctor dominant gene donor drugs emotional environment exist experience fact factors fertilized ovum fibres frontal lobes function Further genes germ cells haemodialysis hand Health Service heart heart-lung machine homosexual hormone hospital human identical twin impulses infant infection ionizing radiation kidney kind latter leads live lobes lungs maintained medicine ment mental mind modern moral motor mucous membrane muscles nature nerve nervous system neurotic normal organic disease ovum pain patient physical pituitary practice predisposes pregnancy problem psychopathic reactions reason reflex relation religion responsible result risk schizophrenia secretion seems sense sexual sleep society sometimes starts stimulation surgery symptoms tend things thyroxine tion tissue transfusion transplantation treatment