Muscle 1 – Skeletal muscle, XS, monkey, H&E 2 – Skeletal muscle, LS, monkey, H&E 3 – Tongue, rabbit, H&E 4 – Tongue, newborn human, iron-hematoxylin 5 – Cardiac muscle, H&E 6 – Duodenum, monkey, H&E 7 – Stomach, monkey, H&E