Semeiotics studies signs and symptoms of the human body to correctly identify, collate and interpret, through diagnostics, the origin of simple or complex diseases. It can also identify the patterns of normality and therefore those conditions that could be pathologic in certain constitutions and are normal for others, such as heart rate, cholesterol, perspiration etc. For example, a sign of low heart rate could be bradycardia in a patient and normal heart function in another, this depends on the expression of genes that contribute to form a specific body type. Semiotics can offer great insight into deficiencies or dysfunctions in many systems of the body and corresponding levels of vitamins, minerals and biochemical balances or imbalances.