Methionine-enkephalin, also known as the opioid growth factor (OGF), is a naturally occurring pentapeptide that exerts tonic inhibition on cell proliferation through its receptor (OGFr). In cancer ...

This study examined the effects of acute restraint stress in the presence or absence of naltrexone on the circulating concentrations of insulin, glucose, Met-enkephalin and corticosterone in ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...