Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
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The year 2012 marked the most recent HS revision, meaning the next revision will not be due until 2017. Since greater commodity detail are needed than the 4- and 6-digit HS headings and subheadings, Harmonized System (HS) codes under the Harmonized Tariff Schedule (HTS) and Schedule B classification systems expand their scope to 10 digits.