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. 1999 Nov 9;96(23):13318–13323. doi: 10.1073/pnas.96.23.13318

Table 1.

Binding of C-peptide and insulin to different cell types

Ligand Cells Receptors/μm2* Kass, 109 M−1
C-peptide Renal tubular  75 ± 12 3.3
Fibroblasts  55 ± 10 2.5
Endothelial  43 ±  4 2.0
Insulin Renal tubular 200 ± 10 1.2
*

Calculated from the number of Rh-C-peptide or Rh-insulin binding sites in the volume element with an area of 0.196 μm2.