Quantification by qPCR of the ssDNA recovered after each round in the three SELEX experiments (A: SELEX-1, B: SELEX-2 and C: SELEX-3). R2 to R9-T refer to the specific rounds of SELEX-1, SELEX-2 and SELEX-3 described in Tables 1, 2 and 3, respectively. Error bars indicate min. and max. values
