Probes are classified into 5 categories:

1. curated_transcript_mapping_probes.tsv
   Probes matching curated RefSeq transcripts (transcripts starting with NM_). For each probe, we provide 
   - the RefSeq transcript accession
   - the number of mismatches with which the probe sequence matched the transcript sequence
   - location within the transcript sequence that is matched by the probe sequence
   - the exon number or the splice junction which is covered by the probe
   - the assembly with respect to which the mapping was calculated (Primary, Celera or Common)
   - the gene name and entrez gene id associated with the transcript

2. uncurated_transcript_mapping_probes.tsv
   Probes matching uncurated RefSeq transcripts (transcripts starting with XM_ or XR_). The same details as above are provided for each probe.

3. intronic_and_near_gene_probes.tsv
   Probes falling in intronic regions or within 500 bp of a Primary assembly transcript. For each probe, we provide
   - the genomic location at which the probe sequence matched the genomic sequences
   - the overlapping gene feature (one of INTRON, UP, DOWN) indicating whether the probe sequence matches a location that falls within the intron of a known transcript, or whether it falls a 500bp region upstream or downstream of a known transcipt
   - the intron number
   - the gene name and entrez gene id associated with the transcript

4. genomic_probes_only.tsv
   Probes matching the genomic sequence but not falling in the above categories. For each probe, we provide 
   - the genomic location matched by the probe sequence
   - the number of mismatches with which the probe sequence matched the genomic sequence

5. no_match_probes.txt
   Probes matching neither the genome nor the transcriptome sequences