Likewise, fish larvae immersed in Pichia pastoris culture supernatant, containing goldfish Acvr2b-ECD, showed enhanced larval growth.     ///    "In addition, the study shows that bioactive fish Acvr2b-ECD can be produced from P. "    ///    The direct inhibitory effect of Acvr2b-ECD on Mstn activity was tested in vitro.     ///    It has been previously shown that WT mice injected with ACVR2B extracellular domain (ACVR2B-ECD) had higher muscle mass. 