In hospitals and university centres and in establishments linked by agreement in application of article L. 6142-5, medical doctors or pharmacists, not qualified in medical biology and recruited in a mixed discipline, may, by decision of the Minister for Health and the Minister for Higher Education and Research, carry out the duties of medical biologist, after receiving the opinion of the committee referred to in article L. 6213-12, when they can prove that they have actually worked for a period of three years in medical biology structures and laboratories. These professionals carry out their duties in the field of specialisation corresponding to the mixed and biological disciplines defined by order of the Minister for Health and the Minister for Higher Education and Research.