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To investigate the role of bHLH proteins in MC3T3 - E1 osteoblasts , which undergo a developmental sequence in vitro , we analyzed the transcriptional control of osteocalcin gene expression by stable transfection of an osteocalcin promoter - luciferase chimeric gene ( p637OC - luc ) and assessed the role of E - box cis - acting elements in osteocalcin promoter by DNA binding assays .
 GENE: bHLH proteins; GENE: osteocalcin gene; GENE: osteocalcin promoter; GENE: luciferase; GENE: p637OC - luc; GENE: osteocalcin promoter
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: bHLH proteins; GENE: osteocalcin gene; GENE: osteocalcin promoter; GENE: luciferase; GENE: p637OC - luc; GENE: osteocalcin promoter