50558
The double-muscling phenotype is a heritable condition resulting in an increased number of muscle fibers ( hyperplasia ) , instead of the ( normal ) enlargement of " individual " muscle fibers ( hypertrophy ) .
 hyperplasia, hypertrophy
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:
 hyperplasia, hypertrophy