PTPN1 and diabetes mellitus: Considering that stress conditions may enhance the production of bioactive compounds [52], recently Ingebrigtsen et al. [53] and Lauritano et al. [52] tested the anti-diabetes properties of several microalgae cultured in stressful conditions, using the PTP1B assay (i.e., evaluation of the Protein Tyrosine Phosphatase 1B inhibition).