The CpG PAMP is recognized by the pattern recognition receptor (PRR) Toll-Like Receptor 9 (TLR9), which is constitutively expressed only in B cells and plasmacytoid dendritic cells (pDCs) in humans and other higher primates.
The trachea is an important structure within your respiratory system, which is the organ system that delivers oxygen to your bloodstream. The trachea is a rigid tube that conducts air from your larynx to your bronchi. The trachea's rigidity is maintained by a series of cartilaginous rings arranged along its length called C-shaped cartilage rings.
Adorable animal families that will make you aww. The windpipe, also known as the trachea, is a part of the respiratory tract through which air passes from the nose or mouth to the lungs. It is membranous and flexible, but its walls contain a number of rings of cartilage that protect it from injury and collapse. The trachea is connected to the larynx above it, and below it are the primary bronchi, which branch from the windpipe to the lungs.