PTPN1 and diabetes mellitus: Other examples of seaweeds that have shown interesting anti-diabetes properties are Cladophora rupestris, able to significantly inhibit α-glucosidase and α-amylase in vitro [28], Derbesia marina and Symphycladia latiscula, able to inhibit PTP1B in vitro [65], and Laminaria angustata Kjellman var.