Young Mammaries (3-4 weeks) Young 3-4 week Csmd1 wt – field 1 Young 3-4 week Csmd1 wt – field 2 Young 3-4 week Csmd1 ko – field 1 Young 3-4 week Csmd1 ko – field 2 Young 3-4 week Csmd1 wt – field 1 Young 3-4 week Csmd1 wt – field 2 Young 3-4 week Csmd1 ko – field 1 Young 3-4 week Csmd1 ko – field 2 14 days mid-gestation Csmd1 wt – field 1 14 days mid-gestation Csmd1 wt – field 2 14 days mid-gestation Csmd1 wt – field 3 14 days mid-gestation Csmd1 KO – field 1 14 days mid-gestation Csmd1 KO – field 2 14 days mid-gestation Csmd1 KO – field 3 14 days mid-gestation Csmd1 KO – field 4 7 days post-weaning Csmd1 wt – field 1 7 days post-weaning Csmd1 wt – field 2 7 days post-weaning Csmd1 wt – field 3 7 days post-weaning Csmd1 KO – field 1 7 days post-weaning Csmd1 KO – field 2 7 days post-weaning Csmd1 KO – field 3 7 days post-weaning Csmd1 KO – field 4