mates - partners , paper - a piece of writing on a particular subject written by an expert and usually published in a book or journal, proof - a fact or piece of information that shows that something exists or is true, genes - a part of the DNA in a cell that controls the physical development and behaviour, immune system - the cells in the body that make it able to protect itself against infection, offspring - a person's children (formal), organs - a part of the body of a person, animal, or plant that performs a special job, guinea pig - a person used in a scientific test, for example to discover the effect of a drug on humans,

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