T cells and B cells differ in the form of the antigen they recognize, and this affects which antigens they can detect. B cells bind to antigen on invaders that are found in circulation outside the cells of the body, while T cells detect only invaders that have somehow entered the cells of the body.
ABS, DWV, Solid or Cell Core sewer pipe. The solid pipe is composed of ABS at 99% while the cell core is composed of a cellular foam between 2 layers of ABS which makes the cell core pipe lighter.
Pex Pipe. Cross-linked polyethylene piping is commonly called pex pipe. It is the material used for water supply in domestic plumbing. The Uponor/Wirsbo sprinkler systems and the Kwench fire sprinkler systems in NFPA 13D fire sprinkler systems use this 1/2 pex pipe in interconnection with the domestic plumbing.ross-linked polyethylene piping is commonly called pex pipe. It is the material used for water supply in domestic plumbing.