|Staphylococcus aureus alpha hemolysin. Not terribly relevant here but it looks nice. Structural view c/o Dcrjsr and Vincent Chen on Wikimedia Commons.|
Here's the citation for the original paper (not quite sure how I missed it as it's been online since this past November, but it's hard to catch everything):
Betts, M. J. et al. Mechismo: predicting the mechanistic impact of mutations and modifications on molecular interactions. Nucleic Acids Res. 43, e10– (2014).