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a) Typical Infrared CH stretching region of meibum from a 17 year-old Caucasian male. b) Typical lipid phase transition of meibum from a 14 year-old Caucasian female who has dry eye induced by an allogeneic hematological stem cell transplantation. The larger the CH stretching frequency the larger the disorder (fluidity) of the lipid. The more trans rotamers the more ordered the lipid.
