4285
Receptor - type serine / threonine kinases ( RSKs ) have been organized into two distinct classes known as types I and II on the basis of sequence similarity .
 GENE: Receptor - type serine / threonine kinases; GENE: RSKs
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: Receptor - type serine / threonine kinases; GENE: RSKs