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These vary from small " bumps " to prominent , nipple-like shapes in the genus " Mammillaria " and outgrowths almost like leaves in " Ariocarpus " species .
 Mammillaria, Ariocarpus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mammillaria, Ariocarpus