affinity
(uh-FIH-nih-tee)
In chemistry and biology, the strength of the attaction between two substances, such as two chemicals, or an antigen and an antibody.
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at opm.gov.