[BiO BB] Extra entries in blast blosum62 matrix

[Sourangshu Bhattacharya]

Hi,

Just wondering what the B, Z, and X entries in blast blosum 62 matrix 
mean.. Any idea ??

Thanks,

Sourangshu

Sourangshu Bhattacharya
PhD Student,
Dept. of Computer Science & Automation,
IISc, Bangalore.

http://people.csa.iisc.ernet.in/sourangshu