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Genome-wide linkage analysis results for the derived factors after adjustment for covariates using the Caucasian families. Note: Factor 1: joint attention; factor 2: social interaction and communication; factor 3: non-verbal communication (rank transformed); factor 4: repetitive sensory-motor behaviour; factor 5: peer interaction; and factor 6: compulsion/restricted interests. The vertical dashed lines separate the chromosomes. LOD = logarithm of odds.
