| A-LAK | adherent lymphokine-activated killer [cell] |
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| APC | acetylsalicylic acid, phenacetin, and caffeine; activated protein C; adenoidal-pharyngeal-conjunctiv... |
| ATC | activated thymus cell; around the clock |
| BaFBr:Eu | europium-activated barium fluorohalide |
| C1a | activated first component of complement |
| left ventricular ejection time | The time measured clinically from onset to incisural notch of the carotid or other pulse; properly the time of ejection of blood from the left ventricle beginning with aortic valve opening and ending with aortic valve closure. (05 Mar 2000) |
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