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- Barriers,Air-Blood
- Barriers,Aqueous-Blood
- Barriers,Architectural
- barriers between different departments or between different regions
- barriers between localities
- barriers between town and country
- Barriers,Blood-Air
- Barriers,Blood-Aqueous
- Barriers,Blood-Brain
- Barriers,Blood-Retinal
- Barriers,Blood-Testis
- Barriers,Brain-Blood
- Barriers,Communication
- barrier screw
- barrier seal
- barrier section
- barrier sediment
- barrier separation
- barrier sheath
- barrier sheet
- Barriers,Hemato-Encephalic
- barrier shield
- barrier shielding
- barriers of a radioactive-waste disposal facility
- barriers of infection
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