Leukotriene
One of a group of chemicals produced by the body that accompanies inflammation. Leukotrienes are believed to play a major role in causing the symptoms of hay fever and asthma.
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- Level 1 biosafety
Level 1 — This level applies to agents that do not ordinarily cause human disease. Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited. Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause […]
- Level 2 biosafety
Level 1 — This level applies to agents that do not ordinarily cause human disease. Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited. Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause […]
- Level 3 biosafety
Level 1 — This level applies to agents that do not ordinarily cause human disease. Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited. Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause […]
- Level 4 biosafety
Level 1 — This level applies to agents that do not ordinarily cause human disease. Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited. Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause […]
- Levite
A member of an ancient caste of hereditary Jewish priests. Membership in the Levites is determined by paternal descent. The Levites have traditionally been considered the descendants of Levi, a son of Jacob. However, research has disclosed an unusual genetic signature called R1a1 on the Y chromosome in more than half of Levite males of […]