Effects of the MRI and the TS dynamo during the MS. Left panel: same as in Fig. 1 but for the set of models discussed in Sect. 4.3. Right panel: (Restricted) diffusion coefficients for the transport of AM, D_mag, O (black), and for the transport of chemical elements, D_mag, X (red), for the sum of both magnetic instabilities in model MTS100 when the central hydrogen abundance reaches X_c = 0.35. The area highlighted in red shows where the MRI is active in the star.