The exact genes responsible for causing each autoimmune disease have not been completely isolated. The treated components are usually electrically isolated. The cffDNA is then isolated and purified. Despite sanitation protocol, patients cannot be entirely isolated from infectious agents. Historically, Ningbo was somewhat geographically isolated from other major cities. Germans were isolated in rural communities for decades. Due to these hazards, diazonium compounds are usually not isolated. However, ebolaviruses have not been isolated in bats. Russia remained isolated from sea trade. Additionally, proteins can be isolated according to their charge using electrofocusing. Some sulfonic acids can be isolated as solids. Elemental phosphorus was first isolated as white phosphorus in 1669. Cocaine was first isolated from the leaves in 1860. Sometimes these pads must be isolated with resistors. Within Paris, opposition was isolated and slow to build.