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In 1787 he began his studies at Jena , where he had as instructors , Johann Jakob Griesbach , Johann Christoph Döderlein and Johann Gottfried Eichhorn .
 Jena, Johann Jakob Griesbach, Johann Christoph Döderlein, Johann Gottfried Eichhorn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jena, Johann Jakob Griesbach, Johann Christoph Döderlein, Johann Gottfried Eichhorn