These isoforms are encoded by two separate genes, CHKA and CHKB and are only active in their homodimeric,heterodimeric and oligomeric forms.
DNA fragmentation factor (DFF) is a heterodimeric protein of 40-kD (DFFB) and 45-kD (DFFA) subunits.
ETFs are heterodimeric proteins composed of an alpha and beta subunit (ETFA and ETFB), and contain an FAD cofactor and AMP.
The protein encoded by this gene is an accessory subunit of the heterodimeric receptor for IL18.
Inhibins are heterodimeric glycoproteins composed of an α subunit (INHA) and one of two homologous, but distinct, β subunits (βA or βB, this protein).
IFNGR2 encodes the non-ligand-binding partner of the heterodimeric receptor.
A giant virion-encapsulated RNAP polymerase which is co-injected (early transcription), a heterodimeric phage RNA polymerase (middle region) and the host RNA polymerase (recognizes late promoters).
Class I RNR enzymes are constructed from large RNR1 and small RNR2 subunits which associate to form an active heterodimeric tetramer.