Table 1

Correlation coefficients calculated for all SAGE tags and for tags present at less than 100 times in total in both libraries examined

Comparisons made

Type of control

Correlation coefficient (all tags)

Correlation coefficient (tags present <100 times only)

ONL1 vs ONL2

Sampling

0.976

0.819

P2.5A vs P2.5B

Library construction from ditag stage

0.938

0.804

Crx^+/+A vs Crx^+/+B

Library construction from mRNA stage

0.939

0.824

41-year-old vs 44-year-old

Individual/environmental variation

0.673

0.580

44-year-old vs 88-year-old

Individual variation/age- and sex-dependent gene expression

0.760

0.628

P6.5A vs P6.5B

Library construction from tissue preparation stage/individual variation

0.661

0.578

Hypothalamus A vs hypothalamus B

Environmental/individual variation

0.782

0.500

Adult retina A vs hypothalamus A

Tissue-specific gene expression

0.763

0.349

Adult retina B vs 3T3 cells

Tissue-specific gene expression

0.479

0.182

Blackshaw et al. Genome Biology 2003 4:R17   doi:10.1186/gb-2003-4-3-r17