[ensembl-dev] VCF question

[Mark Aquino]

Hello,

I have a general VCF format question that I'm having a bit of trouble answering and was hoping someone could help me.  I apologize if this is not the correct forum for requesting this type of information.  At any rate, in the genotype field there are usually fields GT:DP:FT:GL:GQ:HQ in VCF 4.0, but I'm looking at some 1000 genomes data and there is a CB field with values in the individual genotype data SMB, MB, SM, SB, etc.  Could anyone inform me what the CB signifies and what the SMB letter codes mean?

Thank you,
Mark Aquino