Table S1.

Reagents used: Oligonucleotides

Name	DNA sequence	Melting point
B	5′-NH3-AAA AAA AAA AAA AGC CTC ATT GAA TCA TGC CTA-3′	57.4
B′	5′-NH3-AAA AAA AAA ATA GGC ATG ATT CAA TGA GGC-3′	55.9
C	5′-NH3-AAA AAA AAA AAA AGC ACT CGT CTA CTA TCG CTA-3′	57.6
C′	5′-NH3-AAA AAA AAA ATA GCG ATA GTA GAC GAG TGC-3′	56.2
D	5′-NH3-AAA AAA AAA AAA AAT GGT CGA GAT GTC AGA GTA-3′	56.5
D′	5′-NH3-AAA AAA AAA ATA CTC TGA CAT CTC GAC CAT-3′	55.7
E	5′-NH3-AAA AAA AAA AAA AAT GTG AAG TGG CAG TAT CTA-3′	55.7
E′	5′-NH3-AAA AAA AAA ATA GAT ACT GCC ACT TCA CAT-3′	54.7
F	5′-NH3-AAA AAA AAA AAA AAT CAG GTA AGG TTC ACG GTA-3′	56.9
F′	5′-NH3-AAA AAA AAA ATA CCG TGA ACC TTA CCT GAT-3′	56.1
M	5′-NH3-AAA AAA AAA AGT CGA GGA TTC TGA ACC TGT-3′	57.6
M′	5′-Cy3-AAA AAA AAA AAC AGG TTC AGA ATC CTC GAC-3′	56.9

The table provides the sequences of the oligonucleotides used in the protein immunoassays. All oligonucleotides were synthesized by Integrated DNA Technology and purified via HPLC. The DNA-coding oligomers were pretested for orthogonality to ensure that cross-hybridization between noncomplementary oligomer strands was negligible (<1% in photon counts).