ABC transporter ABC transporter A1 ABC transporter A5 ABC transporter G1 ABC transporters ABCA1 protein, human ABCA5 protein, human ABCG1 protein, human ATP Binding Cassette Transporter 1 ATP Binding Cassette Transporter, Subfamily G, Member 1 ATP-Binding Cassette Transporters Article Biological Transport Cells, Cultured Cholesterol Hair Follicle Hair cycle Hair follicle Humans Keratinocytes Liver X receptors Microscopy, Fluorescence SCARB1 protein, human Scavenger Receptors, Class B basement membrane cell culture chemistry cholesterol cholesterol transport controlled study