| The projecting microvillus structure of invertebrate receptors makes this possible. |
| Furthermore, there are transport proteins in the microvillus membrane associated with the passage of sodium ions, D-glucose, and amino acids. |
| The eyes of Pecten also have two retinas, one made up of a layer of conventional microvillus receptors close to the mirror and out of focus, and the second made up of a layer with ciliary receptors in the plane of the image. |
| The ratio of the surface area of a microvillus to the area of the unit cell can be determined numerically. |
| Each microvillus contains a core of actin filaments organized in bundles by actin binding proteins such as villin, fibrin, and espin. |
