tokens: This study examines the cooperative effects of a human estrogen receptor-alpha ( ERalpha ) isoform on estrogen ( E2 ) - mediated gene activation in U2-OS osteosarcoma cells .
folded_tokens: this study examine the cooperative effect of a human estrogen receptor-alpha ( eralpha ) isoform on estrogen ( e2 ) - mediate gene activation in u2-os osteosarcoma cell .