B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow. B cells are involved in the humoral immune response, whereas T cells are involved in cell-mediated immune response. Both B cells and T cells carry receptor molecules that recognize specific targets.
The stipes or stalks of Laminaria cloustoni are used in surgery. The stipes is usually about the same length as the leafy portion. The stipes is about the same length as the leafy portion of the frond. The stipes is somewhat longer than the rachis, and it is of a whity-green colour. How to Know the Ferns S. Leonard Bastin The stipes is very short and it is of a brownish colour, with a few scales. stipes and branches of the leaves very slender and polished. Scales of rhizome and stipes narrow, of firm texture and with thick-walled cells. stipes tufted, two to four inches long, brownish beneath, green above. The Fern Lover's Companion George Henry Tilton stipes dark purple or reddish-brown, polished and decidedly hairy and harsh to the touch, at least on one side.
1. 'disc' or 'disk': a flat circular object. In British English, a disc is a flat circular object. A traffic warden pointed out that I had no tax disc on the windscreen. In American English, this word is spelled disk.