A phosphatidyl-pyridinium bisretinoid compound, A2PE, is formed through condensation of N-retinylidene-PE (NRPE) and a second all-trans-retinol (atRAL) molecule (Parish et al. 1998, Mata et al. 2000). This most likely happens when atRAL is abundant.
Travis, GH, Weng, J, Mata, NL
Hashimoto, M, Parish, CA, Nakanishi, K, Dillon, J, Sparrow, J
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