This article is from the WSSF 2010 AFRMA Rat & Mouse Tales news-magazine.
From Pathology of Laboratory Rodents & Rabbits, Second Edition, Dean H. Percy and Stephen W. Barthold.
Did You Know? Bones of mice do not have haversian systems (one of the cylindrical units of which compact bone is made), and ossification of epiphyseal plates with age is variable and incomplete, depending upon mouse genotype. Hematopoiesis (the process of production of blood cells and platelets which continues throughout life, replacing aged cells) remains active in long bones throughout life.