3 alpha-msh dose-response curves were shifted , in parallel , to the right in the presence of the catecholamines , noradrenaline , adrenaline and dopamine , and lineweaver-burke plots and arunlakshana-schild plots indicated that the catecholamines antagonized msh action by a competitive mechanism .
C0028351
noradrenaline
C0014563
adrenaline