Sterically accessible regions

Bsubunit interacts with pectic polymers and/or other cell wall components and therby sterically access of PG2 from those regions the polymer (as indicated... 

Feldmann and others have developed a series of teaching tools for macromolecular structure using color-coded molecular graphics-derived images 24 28). Connolly and others have improved upon this approach by clearly showing which portions of the protein surface are indeed accessible to a water molecule, as opposed to those portions which are inaccessible, such as in clefts, etc 27). Images based on the Connolly methods directly show those regions of the protein surface which can be expected to interact with other molecules. It provides immediate, comprehensible information about steric complimentarity. 

---