1909
The fatigue exercise showed relatively high blood lactate concentration [ 12 . 5 ( SD 2 . 6 ) mmol x l ( - 1 ) ] and an increase of serum creatine kinase ( CK ) activity delayed by 2 days [ 540 ( SD 407 ) U x l ( - 1 ) ] .
 GENE: serum creatine kinase; GENE: CK
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: serum creatine kinase; GENE: CK