The author was referring to the steam holiday gems. They are a new feature (released yesterday) in which a steam user can turn their extra junk cards/backgrounds/emotes into gems.. These gems can be used to buy more cards; or, during the upcoming holiday event only, to bid on games.
Acinar cells. 1  Acinar cells are the exocrine (exo=outward) cells of the pancreas that produce and transport enzymes that are passed into the duodenum where they assist in the digestion of food.
Additional images. 1  Oligodendrocyte. 2  Confocal image of rat NG-2 positive oligodendrocyte progenitor cells (green color) and GFAP-positive astrocytes (red color) in culture. 3  Section of central canal of medulla spinalis, showing ependymal and neuroglial cells. 4  Transverse section of a cerebellar folium.