CGRP and MBP expression in human C1. (A) Expression of CGRP in human C1. Positive fibers are found within the posterior horn, mostly in laminae I and II. (B, C) Double-staining of CGRP (red) and MBP (green). Arrows point at CGRP positive areas negative for MBP. Nuclei staining (DAPI, blue) is used in the merged pictures. Asterisks point at autofluorescent lipofuscin, which appears yellow in the merged pictures.