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Biology (from Greek "life" study of) is a branch of the natural sciences concerned with the study of living organisms and their interaction with each other and their environment. -- Wikipedia.org
A pathogen, infectious agent, or (more commonly) germ, is a biological agent that causes disease or illness to its host. -- Wikipedia.org
Pharmacology is the study of drug action. More specifically it is the study of the interactions that occur between a living organism and exogenous chemicals that alter normal biochemical function. -- Wikipedia.org
In chemistry, a molecule is defined as a sufficiently stable, electrically neutral group of at least two atoms in a definite arrangement held together by very strong chemical bonds... -- Wikipedia.org
Cytokines are a category of signaling molecules that, like hormones and neurotransmitters, are used in cellular communication. They are proteins, peptides or glycoproteins.
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