808
He was found to be homozygous , and both healthy parents heterozygous , for the R279W mutation in DTDST , and his fibroblasts showed a sulphate incorporation defect typical of DTDST disorders .
 DTDST disorders
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 DTDST disorders