1082
Some elements of the Protopteryx wing bone and muscle structure match those of modern birds , said Zhang and Zhou , but the wing retains a claw found on some primitive birdlike animals .
 Zhang, Zhou
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Zhang, Zhou