2071
Recombinant human IGF - 1 currently represents the only available treatment option for the Laron Syndrome , a rare human disorder caused by defects in the gene encoding growth hormone receptor , resulting in irreversibly retarded growth .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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