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.
Purinergic receptors are one of the evolutionary oldest receptors [9] . The receptor family can be found in almost every mammalian tissue and was initially described in gut smooth muscle cells in the 1970s [7] and [8] .In 2014 the first purinergic receptor, namely DORN1, was discovered in plants [6] .Purinergic receptors are divided into P1 receptors which are preferentially activated by adenosine and P2 receptors which are activated by a variety of nucleotides.he role of P1 receptors in MSC proliferation is not well studied. There is some evidence suggesting that adenosine and the adenosine A2A receptor are important mediators in stimulating proliferation and differentiation of mouse BM-MSCs [96] .