Figure 4.

The subpodocyte space (SPS) GFB showing the disposition of membrane domains in foot processes as in Figure 2. Ordinary foot processes (OFP) have signaling networks that are well defined. The less frequent anchoring foot processes (AFP) could have some of the features of (OFP) but must have some differences based upon their altered response to increased perfusion pressure. Arrowheads mark the possible asymmetric slit diaphragm between OFP and AFP. Question marks show the possibility of differences in all three membrane associated domains.