Bright green , neural retina ; off green , pigment epithelium ; blue , nuclei ; red , active myosin ( strong in the inner surface of pigment epithelium ) .
Springer wanted to know whether these organisms , dictyostelium discoideum , would continue to grow even when deprived of a crucial motor protein , myosin .
He discovered that myosin is only needed for the first and final stages of the amoeba 's development and that , in all stages between , myosin is like a candy bar after lunch -- nice but not needed .
