title: Variation in skin surface lipid composition and sebum excretion rate with time.
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D004952:Esters / Q000378:metabolism; D005230:Fatty Acids, Nonesterified / Q000378:metabolism; D006801:Humans; D050356:Lipid Metabolism; D008297:Male; D008722:Methods; D008875:Middle Aged; D012629:Sebum / Q000378:metabolism*; D012874:Skin Diseases, Infectious / Q000378:metabolism; D013185:Squalene / Q000378:metabolism; D014280:Triglycerides / Q000378:metabolism
chemical_list: D004952:Esters; D005230:Fatty Acids, Nonesterified; D014280:Triglycerides; D013185:Squalene