The following Cellular Components were removed from the object panel in PathVisio3 at some point. Should they be included in PathVisio4?
NUCLEOLUS = oval
VACUOLE = oval
LYSOSOME = oval (used in WP2287.gpml, WP2507.gpml)
CYTOSOL_REGION = roundRect
MEMBRANE_REGION= roundRect (used in WP2817.gpml, WP4847.gpml)