“These are made by applying to the face a soft material such as wax, plaster, or, in modern times, agar, a vegetable gelatine.”

“Starved border cells plated on to nutrient agar demonstrated no sign of contamination after 48 h incubation.”

“So things like common salt, sugar and agar have to be documented even though harmless.”

“The digest was fractionated overnight on an agarose gel as described above.”

“After incubation the agarose was washed successively with dioxane solution, dioxane, distilled water and ethanol.”

“Somatic embryos at late developmental stages were gently extracted from agarose layers with forceps.”