Protease cleavage

[Bio-student]

If an endoprotease is known to cleave "at" a particular residue - for instance "at" S102 - does it cleave N-terminally or C-terminally of S102? In other words, is the residue which the enzyme cleaves "at" retained in the modified protein or lost along with the 'waste'?

Thanks for any help.

[atyy]

They don't say?

http://www.neb.com/nebecomm/products/productP8104.asp
http://www.neb.com/nebecomm/products/productp8100.asp
http://www.ncbi.nlm.nih.gov/pubmed/9440697
http://www.ncbi.nlm.nih.gov/pubmed/21878653
http://www.ncbi.nlm.nih.gov/pubmed/18463091