5572
The first genetic defect in human signal transducer and activator of transcription ( STAT ) 5b was identified in an individual with profound short stature and GH insensitivity , immune dysfunction , and severe pulmonary disease , and was caused by an alanine to proline substitution ( A630P ) within the Src homology - 2 ( SH2 ) domain .
 Chemical: alanine; Chemical: proline
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: alanine; Chemical: proline