The signalling nucleotide 2',3'-cAMP (Biolog Cat. No. A 307) immobilized on agarose by an aminohexylcarbamoyl spacer attached to the 5' ribose position of the ligand. The gel may be useful for affinity chromatography of 2',3'-cAMP-responsive proteins. Normally all affinity gels are supplied in pre-packed columns. The free beads without a column are available upon request. Corresponding negative control gel without nucleotide modification: E 010