True regarding Na+ – K+ pump
Structure of Na+K+ pump
2 subunits- α subunit is larger and β subunit is smaller. 
Hence it is Heterodimer.
α subunits- α1, α2 & α3 isoforms.
β subunits- β1, β2 & β3 isoforms. Hence it is heterogeneous.
Hetrodimer – homogenous
Hetrodimer – heterogenous
Homodimer – heterogenous
Homodimer – homogenous