Figure 1. Concept of catch-and-release of target cells.

(A) Procedures for selective capture and subsequent detachment of target cells using a surface modified with the zwitterionic oligopeptide SAM and the aptamer. (B) Setup of the two-electrode system consisting of a gold working electrode (W.E.) and a Ag/AgCl reference electrode (R.E.). The gold substrate was connected to four clips to alleviate a voltage drop.