⁃ In order to be eligible to participate in this study, an individual must meet all of the following criteria:

• Stated willingness to comply with all study procedures and availability for the duration of the study.

• Male or female, aged 18 years and over. Children are excluded for the following reasons: age at onset of BD is usually later than age 18, the diagnostic and assessment instruments we use are not validated in children.

• In good general health as evidenced by medical history or diagnosed with or exhibiting symptoms of bipolar disorder or related conditions not attributable to substance abuse, or neurological disease; OR a 1st or 2nd degree relative of an enrolled participant. Related conditions are defined as those found more often among relatives of people with bipolar disorder or which have been shown to be genetically correlated with bipolar disorder through molecular genetic studies. These include major depression, schizophrenia, panic disorder, and attention deficit hyperactivity disorder.

• Ability to safely provide a blood or saliva sample.

• Ability of subject to understand and willingness to sign a written informed consent document.