Hi Peng,
   The IDs were originally just a number, but letters were added to 
increase the amount of items we could represent. IDs are assigned as 
genes are added, so two related genes could have dissimilar IDs if they 
were added at different times. The '.#' represent variations of the gene.
I hope this answers your questions. Please feel free to contact us again.

Antonio Coelho
UCSC Genome Bioinformatics Group

Peng Yu wrote:
> I try to understand if there is any meaning in the knownGene name. Or
> it is just a randomly assigned id? Would you please let me know?
>
> uc009jzr.1
>
> I assume uc stands for Univ of California. What's 009? What is jzr?
> Why don't just use a single number? What is '.1'?
>
>   

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