Fig. S4. Temporal and spatial expression pattern of Custos in Xenopus embryo. (A) Xenopus Custos is expressed throughout development. The expression
level of Custos RNA was assessed by RT-PCR analysis. Ornithine Decarboxylase (ODC) was used as an internal control, RT(â) is without reverse transcriptase as
a negative control. (B) Custos is highly expressed in the anterior region of the embryo. Whole-mount in situ hybridization was performed using a Xenopus
Custos anti-sense RNA probe. No signal was detected using a Custos sense RNA probe. (C) Expression of Custos does not induce or suppress levels of activated
RhoA in HEK-293T cells; the GEF Ephexin is used as a positive control. (D) Sequence of Xenopus Custos antisense morpholino oligonucleotide (MO) is indicated
by red letters.