Fig. 1

Expression patterns of alk3 and alk6 in early Xenopus laevis embryos. a Temporal and spatial expression patterns were determined by whole-mount in situ hybridization at the indicated Nieuwkoop and Faber (NF) stages. b Expression of alk3 and alk6 was quantified by Real-Time RT-PCR at the indicated stages; corresponding synthetic sequences were used a external standards for copy number determination. The graph shows the copy number per embryo. c NF stage 10.5 embryos were bisected into dorsal and ventral halves and transcripts of the indicated genes were detected by RT-PCR