====== BioGRID ORCS - Matrix Tab (*.matrix.tab.txt) ======
The BioGRID ORCS Matrix Tab file contains all of the genes and score values associated with a multiple screens in a single file. It is a tab-delimited file and the columns contained are outlined below. 

[[orcs:downloads|Back to BioGRID ORCS Download Formats]]

==== How to detect a BioGRID ORCS Matrix File ====
BioGRID ORCS Screen files are denoted by the extension **.matrix.tab.txt**

==== Header Definitions ====
The first line of a BioGRID ORCS Matrix file is the heading line and starts with a hash (#). This line is purely for informational purposes and gives a brief description of the content contained in each column. If you are scripting the use of this file, you can simply ignore it.

==== Matrix Column Definitions ====
The column contents of BioGRID ORCS Matrix Files should be as follows:

  - **Screen ID** - A unique identifier in the BioGRID ORCS database representing this screen. You can match this value with the similarly named value provided in the [[orcs:downloads:screen_index|screen index file]]
  - **Identifier ID** - An identifier for the gene represented by the row. This is generally an ENTREZ_GENE ID, but will sometimes contain an alternative ID when the original dataset was ambiguous or we were unable to map the name used by the original authors.
  - **Identifier Type** - This will be the name of the source database, but can also be AMBIGUOUS or UNKNOWN if we were unable to definitively map the original authors dataset.
  - **Official Symbol** - The official name for the gene
  - **Aliases** - List of common aliases for the gene
  - **Organism ID** - The NCBI Taxonomy ID of the organism used in this screen (example: 9606 for Human)
  - **Organism Official** - The NCBI official name for the organism used in this screen (example: Homo sapiens for Human)

== Repeated Columns ==
The following columns will be repeated N times, where N represents the number of screens in the matrix dataset. Each column will be prefixed with the screen id. For example 255-Score.1, 255-Score.2, 255-HIT etc.

  - **<SCREEN_ID>-Score.1** - The first score value, the type of score presented will be provided in the [[orcs:downloads:screen_index|screen index file]]
  - **<SCREEN_ID>-Score.2** - The second score value (if necessary), the type of score presented will be provided in the [[orcs:downloads:screen_index|screen index file]]
  - **<SCREEN_ID>-Score.3** - The third score value (if necessary), the type of score presented will be provided in the [[orcs:downloads:screen_index|screen index file]]
  - **<SCREEN_ID>-Score.4** - The fourth score value (if necessary), the type of score presented will be provided in the [[orcs:downloads:screen_index|screen index file]]
  - **<SCREEN_ID>-Score.5** - The fifth score value (if necessary), the type of score presented will be provided in the [[orcs:downloads:screen_index|screen index file]]
  - **<SCREEN_ID>-Hit** - This will be YES, NO, or N/A to indicate whether or not this gene is considered a "HIT" by the original authors.

**All columns are mandatory so columns with no values are filled with "-"**