What are the molecules on the left side of a chemical equation called

The substances used in the beginning of a chemical reaction are called the reactants (usually found on the left side of a chemical equation), and the substances found at the end of the reaction are known as the products (usually found on the right side of a chemical equation).

Explanation:

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

not too sure but maybe in the hot springs.