Input structure: Upload PDB file to process: Enter PDB ID to process:   Use biological unit? Use hetero atoms? Grid resolution: crude low medium high PyMOL compatible Share your results	Outer probe radius: Inner probe radius: Choose one of the following options: Minimum accessible volume of a channel: Å3 Minimum percentage of total volume: % Get the N largest channels: channels
PRESET EXAMPLES:

Channel Finder – possible the most useful program here. The channel finder can pull interesting channels out from a structure. For example, the exit tunnel from the ribosome, the internal cavity of GroEL and many others. Channel finder works by calculating the shell volume (A) and then subtracts the solvent-excluded volume (B) from the shell volume (A) the resulting volume is the solvent volume (C). Next it only takes the solvent volume that is connected to a point specified by you.