sera

"The lab technician carefully extracted the sera from the clotted blood samples for further analysis. "

"To protect against the rare but deadly disease, the doctor injected the patient with sera from horses immunized against the virus. "

"The blister on my heel broke, releasing a clear sera. "

"After the milk curdled, a clear, yellowish sera separated from the solid cheese curds. "

"After cleansing my face, I apply a thin layer of sera to hydrate my skin before using my regular moisturizer. "