Illumina offers two methylation BeadChips: the HumanMethylation27 and the HumanMethylation450. The difference between the two is the content. Where the HumanMethylation27 BeadChip interrogates over 27 thousand CpG loci (covering around 14 thousand genes), the HumanMethylation450 covers around 450 thousand sites.
No. ServiceXS does not offer DNA isolation services nor bisulfite conversion at the moment. We can advise you on which kits to use. Contact us directly for consultancy.