B) Histology of 25-day old mice with partial degeneration of Purkinje Cells. Note that both, Ccp1-/- and Ccp1-/-Ttll7-/- brains, show highly similar pattern of partial Purkinje-cell loss (red arrow heads: gaps in the Purkinje-cell layer, indicating degenerated Purkinje cells; orange arrow heads: swellings of Purkinje-cell axons, indicative of ongoing degeneration). 