Since these cytoplasmic proteins lack a secretory signal sequence, the presence of FABPs in serum is considered to be a biochemical marker of tissue injury in related cells that produce FABP proteins: FABP3 (H-FABP) for acute myocardial infarction and ongoing myocardial damage in heart failure, FABP7 (B-FABP) for brain injury, and FABP2 (I-FABP) for intestinal damage [76–78]. Here, FABP7 is linked to heart failure.