Table 1. Oligonucleotides used in this study.

Method	Symbol	Oligonucleotide
Morpholino
Control	con MO	5′ CCTCTTACCTCAGTTACAATTTATA
int6 Translation block	int-6 MO	5′ GGTCAGATCGTACTCCGCCATGATG
int6 5-base pair mismatch	int-6 5MM	5′ GGTgAGATCcTAgTCCGCgATcATG
siRNA
INT6 sense siRNA (si)	INT6-siRNA	5′ GAACCACAGUGGUUGCACAUU
INT6 reverse siRNA (R)	R	5′ UUACACGUUGGUGACACCAAG
RT-PCR primers
MEK1 forward		5′ ATTATTGTTCCCCTAAGTGGATTG
MEK1 reverse		5′ TTACAACAGCATTGGTACTTGGAT
INT6 forward		5′ ATGGCGGAGTACGACTTGACT
INT6 reverse		5′ TCAGTAGAAGCCAGAATCTTGAGT
Actin forward		5′ CGTGATGGTGGGCATGGGTCA
Actin reverse		5′ CTTAATGTCACGCACGATTTCC