Table 1.

LC/MS-MS identification of potential proteins in the cytosol of MCF-7 human breast cancer cells that can directly bind E₂ or bind to E₂-bidning proteins.

Protein band in Fig. 3B	Number of peptides	Proteins identified
a	14	prolyl 4-hydroxylase β-subunit (PDI) [190384|gb|AAC13652.1]*
	11	pyruvate kinase [35505|emb|CAA39849.1]
	6	chaperonin containing TCP1, subunit 6A [76827911|gb|AAI06943.1]
	5	CCT7 [48145555|emb|CAG33000.1]
b	33	prolyl 4-hydroxylase β-subunit (PDI) [190384|gb|AAC13652.1]
	12	pyruvate kinase [35505|emb|CAA39849.1]
	10	60 kDa chaperonin (Protein Cpn60) (groEL protein) [2493643|sp|P95800]
	6	chaperonin containing TCP1, subunit 6A [76827911|gb|AAI06943.1]
c	18	heat shock 70 kDa protein 8 isoform 2variant [62896815|dbj|BAD96348.1]
	10	thyroid autoantigen 70 kDa [57165052|gb|AAW34364.1]
	3	heat shock 70 kDa protein 9B precursor [24234688|ref|NP_004125.3]
d	23	heat shock 70 kDa protein 8, isoform 1 [16741727|gb|AAH16660.1]
	11	prolyl 4-hydroxylase β-subunit (PDI) [190384|gb|AAC13652.1]
	6	thyroid autoantigen 70 kDa (Ku antigen) [57165052|gb|AAW34364.1]

^*The protein access number is provided in the bracket following the protein name.