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topical membership is not evidence of a direct dietary effect.\nplain_language: ABCA4 moves the trapped retinal-lipid adduct to the disposal side of the disc.\norganism: Bovine/mouse discs; recombinant transporter\ntissue_or_cell_type: Photoreceptor disc membrane\nexperimental_model: Proteoliposomes and native disc transport assays\nlimitations: The assayed substrate is the adduct, not a requirement for free retinal diffusion.\ntransport_direction: disc lumen leaflet to cytoplasmic leaflet\n[quazi-2012] ABCA4 is an N-retinylidene-phosphatidylethanolamine and phosphatidylethanolamine importer (2012). https://pmc.ncbi.nlm.nih.gov/articles/PMC3871175/ DOI: 10.1038/ncomms1927","model_system":"Proteoliposomes and native disc transport assays","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study references: [quazi-2012] ABCA4 is an N-retinylidene-phosphatidylethanolamine and phosphatidylethanolamine importer (2012). https://pmc.ncbi.nlm.nih.gov/articles/PMC3871175/ DOI: 10.1038/ncomms1927","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"0c5474e2-be48-547b-b287-9c07a59c9ff1","stable_key":"import-dff9f743-3766-5f20-a71e-d6d2bd5bfb6f","title":"Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17)","document_type":"imported_text","citation_label":"AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text.","file_path":"","sha256":"b217224b262abbd77d6a0c8c9beefff9c022fae4d31e2a5273915d769b9a6546","revision_id":"61008909-871f-575c-b5e2-21542689ea3c","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}