Probe Design information for the Illumina Infinium HumanMethylation 450k array. To each probe is associated the design type, either Infinium I Green, Infinium I Red or Infinium II. Probe names follows Illumina's annotation (names of the form "cg00000029").
A data frame containing two columns.
$Probe_Name contains the names of the probes, and
$Design_Type contains the design information ("I Green", "I Red" or "II").