129436
Three of the skulls displayed evidence that they had experienced violence ; a probable adult female had an unhealed injury on the left frontal bone , an adult of indeterminate sex had an unhealed fracture on the left frontal , and a second adult female had a healed depressed fracture on the right frontal .
 frontal bone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 frontal bone