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Code should be placed in three backticks as shown below

```# calucluate the overlap with features Sin3.features <- assignChromosomeRegion(Sin3, TxDb=txdb, nucleotideLevel=FALSE)

include your problematic code here with any corresponding output

please also include the results of running the following in an R session

sessionInfo( )

```# calucluate the overlap with features Sin3.features <- assignChromosomeRegion(Sin3, TxDb=txdb, nucleotideLevel=FALSE) Error in assignChromosomeRegion(Sin3, TxDb = txdb, nucleotideLevel = FALSE) : could not find function "assignChromosomeRegion"