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Physician Assistants (PAs) are health care professionals licensed to practice medicine under physician supervision. They are formally trained to provide diagnostic, therapeutic, and preventive health care services. Within the MD/PA relationship, PAs conduct physical examinations, diagnose and treat illnesses, order and interpret laboratory tests and xrays, counsel on health care issues, and assist in surgery. They also treat injuries by suturing, splinting and casting. PAs record progress notes, instruct and counsel patients, and order or carry out therapy. The PA's practice is centered on patient care and may also include educational, research, and administrative activities.