Of the various genetic linkage and association studies, which one seems to be a possible "marker" for schizophrenia?

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Eye-tracking has been found to be a promising marker for schizophrenia based on genetic linkage and association studies. People with schizophrenia tend to have difficulty in maintaining steady fixation on a visual target, and this abnormality in eye movements may be associated with underlying genetic factors.

Of the Various Genetic Linkage and Association Studies, Which One