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Table 1 A description of the column names contained in the annotation file in Marmal-aid

From: Marmal-aid - a database for Infinium HumanMethylation450

Column name

Description

ID

ID used to identify sample. If from GEO this is the GEO accession number

SAMPLE_NAME

A long descriptive name of the sample

GSE

The GSE number which can be used to a certain whether samples are from the same experiment.

LINEAGE

The lineage of the tissue

TISSUE

Main tissue type E g. Blood, Brain, Liver, Kidney

TISSUE_SUBTYPE

Further sub categorisation of the tissue E g. for Blood this may be CD19, CD4 etc

TRANSFORMED

If a transformed cell line the name of the line is given in this column

DISEASE

Indication of the disease state of the sample. NA here means no information was recorded and is most likely healthy.

DISEASE_SUBTYPE

A further charaterisation of the disease state E g. if the DISEASE column contains Cancer then this column will indicate what type

SEX

The sex of the sample if given as taken from the annotation file

SEX_PRED

The prediction of the sex of the sample using autosomal probes

AGE

The age of the sample if given.

ADDITIONAL

Any additional information that could not be described in the other columns.