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.
It carries air from the mouth or nose to the lungs. The trachea brings air into the lungs but it doesn't help with the digestive system. The trachea is neither bone, nor tissue. It is a rigid muscular tube that connects the nose and mouth to the lungs.The trachea or wind pipe as it is called is a tube which connects the mouth to the lungs and is a passage for air to be conducted during breathing. The trachea allows air to go past the larynx and into either the left and right bronchi.he trachea (or windpipe) is the tube forming a passage that delivers air to and from the lungs. The trachea also contains the ciliated cells and goblet cells that are able to trap and sweep out dust.