Nanoliter spotting technology can be used to immobilize proteins within a confined area on the sensor chip.

The figure on the right shows an array of 400 proteins spotted in a 20x20 grid.

The spotted surface is assembled into a flow cell that is about the size of a dime.

The number of molecules spotted on a given surface can vary from 1 to around 600 depending on the resolution of the spotting technology.

Examples of array data.