A shower flow control device for quickly shutting off the flow of water through a shower head. A UI tier receives the image of the UI to create a user UI. Various combinations of differentiation factors and mitogens can be used to produce cell populations that are over 95% homogeneous in morphological appearance, and the expression of oligodendrocyte markers such as GalC. The swing head is mounted on the supporting portions and has a toothed part. When a match occurs, the comparison circuitry implements a block repair by activating the redundant row and by causing data to be written to or read from the activated redundant row.