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.
Acinar cells that separate enzymes or bicarbonate - Helps transport enzymes in digestion. Islet cells that secrete insulin or glucagon - Produces hormones, helps cells absorb sugars to restore/maintain energy levels. Blood vessel - Supply blood to the heart.