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. 2013 Sep;14(9):763–773. doi: 10.1631/jzus.B1300051

Fig. 3.

Fig. 3

Eleven bis-retinoids associated with formation of retinal pigment epithelial (RPE) lipofuscin

Structures, UV-visible absorbance (nm), and electronic transition assignments (↔) are shown. All of these fluorescent di-retinal pigments have dual conjugation systems located in two side-arms, conferring light-induced absorbance in both the ultraviolet and visible regions