Isolated populations of fetal renal stem cells and progenitor cells are provided. The strap is held in place in a channel by means of a rocker arm which is biased to press the strap against a portion the strap positioned in the channel. Retimer flip-flops may be coupled between adjacent flip-flips to resynchronize the signal being coupled through the flip-flops. The first path includes a first data detector that generates a first detected data signal in response to detecting data in the read data signal. The openings are of a uniform size so that the area of decoupling can be produced in a simple manner.