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.
Trachea Definition, Functions and Parts Concerning trachea definition, it is an important anatomical structure that is an integral part of respiratory system in humans and other higher animals. Allowing the passage of air (respiratory gases) it connects larynx (voice box) and pharynx with lungs.