Loss of RBP-J results in a reduction of segments due to total branch loss with age. Loss of RBP-J results in a reduction of segments due to total branch.

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Loss of RBP-J results in a reduction of segments due to total branch loss with age. Loss of RBP-J results in a reduction of segments due to total branch loss with age. (A) Schematic illustrating a model of branch reduction in RBP KO IHBD casts. Upper panel represents a portion of the IHBD at a younger time point. This portion contains one originating branch with two side branches emanating from it. In this simplified example, the younger time point has five segments (S) and an initial frequency of a given diameter of 5 counts (C). As seen in Figs 3 and 4, there is a reduction in all branch diameter frequencies in RBP KO mice with age. This might be due to branch shortening (Option #1) and/or branch loss (Option #2). In either case, the frequency of branch diameter is reduced to 4C. To elucidate the difference between these two options, the number of segments must be examined. In the case of branch shortening, the number of segments would not be affected (5S); however, in the case of branch loss, there would be a reduced number of segments (3S). (B) The average number of segments, where a segment is defined as the portion between branch points, is consistent with age in control IHBD casts. In RBP KO IHBD casts, there is a progressive loss of segments compared with control. Conversely, NICD IHBD casts show a consistent, but not significant, increase in segments with age. Error bars represent s.e.m. *P≤0.05. Erin E. Sparks et al. Dis. Model. Mech. 2011;4:359-367 © 2011. Published by The Company of Biologists Ltd