TABLE 1.

Mice were used in these studies

Strain	Age	Number
K999N	8 weeks	5
WT control	8 weeks	10
K1113D	8 weeks	8
K999N	6 months	4
K1113D	8 months	3
WT	8 months	4
K1113D	12–13 months	3
WT	12–13 months	4
WT	20 months	3