Term: isoenzyme, isozyme
Literally meaning: equal enzymes
Origin: Anc Greek
ίσος/isos(=equal) combining form ισο-/iso- eg isomer, isopod
ένζυμο/enzymo(=enzyme) > εν/en(=in) + ζύμη/zime(= leaven)
in 1959 by Markert and Moller
Isozymes or isoenzymes are enzymes that although catalyze the same chemical reaction they have different physical biochemical and immunological properties due to different amino acid sequences.