3412
C4 phenotyping in 20 patients and in 26 parents showed that 90 % and 81 % , respectively , had null allotypes at either the C4A or C4B locus compared with 59 % in controls , indicating that defective expression of structural genes may contribute to the observed C4 deficiency . .
 Disease: C4 deficiency
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: C4 deficiency 
Answer:
 Disease: C4 deficiency