Extracting CpG annotations

Meffil has annotations implemented for the 450k and EPIC arrays. The positions are based on hg19, b37.

meffil.list.featuresets()
#[1] "450k"   "common" "epic"   "epic2" 

y<-meffil.get.features("epic")
head(y)
##  type      target       name chromosome  position meth.dye
##1   ii methylation cg07881041      chr19   5236016        G
##2    i methylation cg18478105      chr20  61847650        G
##3   ii methylation cg23229610       chr1   6841125        G
##4   ii methylation cg03513874       chr2 198303466        G
##5    i methylation cg09835024       chrX  24072640        R
##6   ii methylation cg05451842      chr14  93581139        G
##           cpg.island.name relation.to.island snp.exclude
##1    chr19:5237294-5237669            N_Shore       FALSE
##2  chr20:61846843-61848103             Island       FALSE
##3     chr1:6844313-6846366            N_Shelf       FALSE
##4 chr2:198299244-198299972            S_Shelf       FALSE
##5   chrX:24072558-24073135             Island       FALSE
##6  chr14:93581083-93582797             Island       FALSE