2. sum(SP2) is the total number of SP2 carbon atoms, max ASA and Bulkiness are described in the references listed, twitter character limit ties my hands a bit here. Briefly, maxASA is the highest ASA for an amino acid in the tripeptide Gly-X-Gly in all biophysical conformations.
2. In the Judred parameters, what does sum(SP2) means? Is it the total number of SP2 hybridized atoms? What is Max SASA and how do you define bulkiness?