What are subunits?

Some articles on subunit, subunits:

Cytochrome C Oxidase Subunit III
... Cytochrome c oxidase subunit III is one of main transmembrane subunits of cytochrome c oxidase Cytochrome c oxidase is an oligomeric enzymatic complex that is ... and eukaryotic cytochrome c oxidase contains three common subunits, I, II and III ... In prokaryotes, subunits I and III can be fused and a fourth subunit is sometimes found, whereas in eukaryotes there are a variable number of additional small subunits ...
CACNA2D2
... Voltage-dependent calcium channel subunit alpha2delta-2 is a protein that in humans is encoded by the CACNA2D2 gene ... This gene encodes a member of the alpha-2/delta subunit family, a protein in the voltage-dependent calcium channel complex ... upon membrane polarization and consist of a complex of alpha-1, alpha-2/delta, beta, and gamma subunits in a 1111 ratio ...
Cox10
... This component is a heteromeric complex consisting of 3 catalytic subunits encoded by mitochondrial genes and multiple structural subunits encoded by nuclear genes ... The mitochondrially-encoded subunits function in electron transfer, and the nuclear-encoded subunits may function in the regulation and assembly of the complex ... gene encodes heme Afarnesyltransferase, which is not a structural subunit but required for the expression of functional COX and functions in the maturation of the heme A prosthetic group of COX ...