Please choose the correct ending to complete the given sentence: Health: [header] How to study the functions of protein hormones in humans [title] Define protein hormones. [step] Protein hormones are a type of chemical compound in the body that regulate metabolism and cell function. They are derived from amino acids (the building blocks of proteins) and facilitate signaling between cells of the endocrine system and various other cells of the body.

Ending1: They are not linear or coil-bound. You can study how an endocrinologist uses protein hormones in different ways. Ending2: Some essential molecules that are found in proteins include : [substeps] Manganese (gathered from it's source) microcadcadmium, too. It is found in the metabolic molecules produced by the calcium in the hydroponic molecule. Ending3: But, protein hormone is not a primary function of the body. Here is a formula that is associated with the principles in science: that is how many cells of the body each are composed of. Ending4: [substeps] Hormones regulate a number of biological processes such as muscle growth, heart rate, hunger, and menstrual cycles. Proteins are a class of biochemical compounds found in the body of all living systems.

Answer format: ending1/ending2/ending3/ending4