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: The trachea is also known as windpipe. The trachea filters the air we inhale and branches into the bronchi. Bronchi: The bronchi are the two air tubes that branch off of from the trachea and carry atmospheric air directly into the lungs.Lungs: The main organ of the respiratory system is lungs. Lungs are the site in body where oxygen is taken into and carbon dioxide is expelled out.rachea: The trachea is also known as windpipe. The trachea filters the air we inhale and branches into the bronchi. Bronchi: The bronchi are the two air tubes that branch off of from the trachea and carry atmospheric air directly into the lungs.