Hepler identified actin microfilaments in bundles at the ectoplasm-endoplasm interface of " Nitella " internodal cells by showing that the bundles bound heavy meromyosin, giving the characteristic arrowhead arrangement.
12.
"The Radiolarian Series " takes its name from radiolarians ( also radiolaria ), amoeboid protozoa that produce intricate mineral skeletons, typically with a central capsule dividing the cell into inner and outer portions, called endoplasm and ectoplasm.
