Fig. 2: First report using agarose gel electrophoresis to separate LDH isoforms in mitochondria from rat liver and heart.
From: Tracing the lactate shuttle to the mitochondrial reticulum

LDH isoenzyme patterns differ between the cytosol and mitochondria in both tissues. Note cytosolic and mitochondrial LDH isoform differences between the cytosol and mitochondria across tissues. From Brooks et al.13.