Simplify the following text for a Grade 10 native English-speaking person.
Original: Cytokines can be classified as proteins , peptides , or glycoproteins ; the term `` cytokine '' encompasses a large and diverse family of regulators produced throughout the body by cells of diverse embryological origin .
Simplified: They are proteins , peptides , or glycoproteins . The term cytokine encompasses a large and diverse family of polypeptide regulators that are produced widely throughout the body by many groups of cells .