Basophil

Basophils is a general term used in histology for structures that "love" base, and which usually show up deep blue under standard staining techniques (H&E). Specifically, it can refer to:
 * basophil granulocyte
 * anterior pituitary basophil

Basophils are white bloodcells that release histamines in the inflammatory response in the second line of defence in the human immune system