Format: Paperback Verified Purchase. This is an awesome book, Just what I needed for my class to read. I am doing a unit on biomes and this book hits the spot. It is informative and gives just the tight amount of information without being overbearing for the students in my class.
Pernicious anemia is a rare blood disorder characterized by the inability of the body to properly utilize vitamin B12, which is essential for the development of red blood cells. Most cases result from the lack of the gastric protein known as intrinsic factor, without which vitamin B12 cannot be absorbed.
1 Pernicious anemia is defined as a type of vitamin B12 deficiency that results from impaired uptake of vitamin B-12 due to the lack of a substance known as intrinsic factor (IF) produced by the stomach lining.  Pernicious anemia is a condition caused by too little vitamin B12 in the body.