| The porphyrin solutions were handled in the dark to avoid any photobleaching. |
| An iron porphyrin, called heme, is the portion of hemoglobin that carries oxygen from the lungs to our body's cells. |
| Changes in apoprotein and porphyrin fluorescence suggest two classes of bound porphyrins. |
| The redshift in the absorption spectrum reflects electronic interactions between the porphyrin and the melanins. |
| This turnover releases significant amounts of the iron-free portion of heme, porphyrin, which is subsequently degraded. |
| The breakdown of porphyrin yields bilirubin, a product that is non-polar and therefore, insoluble. |
