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Semaphorin 7A ( Sema7A ) is a membrane - linked semaphorin that is expressed by human keratinocytes , and we have shown that Sema7A binds to human melanocytes through beta1 - integrins and the Plexin C1 receptor .
 membrane, keratinocytes, melanocytes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 membrane, keratinocytes, melanocytes