Fig. 8. Expression of the gapA and rtoA genes in response to membrane permeant cyclic nucleotide analogues. Ax2 cells were subjected to development and induced with 8-bromo AMP or 8-bromo GMP as described in the legend to Fig. 5. After 15 and 30 minutes of induction, total cellular RNA was isolated and analysed by northern transfer as in Fig. 7.