Hello All,

I was wandering how biomart retrieves data for the gene given
chromosome_name and position, i.e. in the query for mouse genome I have
809 positions, but the returned entrezids have different length.

res1=getBM(attributes="entrezgene", filters =
c("start","chromosome_name"), values = list(positions,Chr_positions),
mart=ensembl) 

dim(res1)

[1] 2711    1

> length(unique(res1[,1]))

[1] 2205

Does this mean that for the probes located in the midlevel between genes
two nearest are returned?

Thanks!

Best

Sergii Ivakhno

 

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