These symptoms tended to develop in mice 6 to 12 months after birth, about 
(These symptoms; tended; to develop in mice 6 to 12 months after birth, about) (These symptoms; to develop about; L:in mice; T:6 to 12 months after birth)
These symptoms These symptoms
tended to develop about
to develop in mice 6 to 12 months after birth, about
L:in mice T:6 to 12 months after birth