Table S1.

Genotyping primers

Mouse line	Primer name	Primer sequence
Col1A1 (iLIN28B, iLet-7)	ColfrtA	GCA CAG CAT TGC GGA CAT GC
	ColfrtB	CCC TCC ATG TGT GAC CAA GG
	ColfrtC	GCA GAA GCG CGG CCG TCT GG
M2-rtTA	rtTA A	GCG AAG AGT TTG TCC TCA ACC
	rtTA B	AAA GTC GCT CTG AGT TGT TAT
	rtTA C	GGA GCG GGA GAA ATG GAT ATG
rtTA-EGFP	rtTA mutant - F	GAG TTC TCT GCT GCC TCC TG
	rtTA mutant - R	AAG ACC GCG AAG AGT TTG TC
	rtTA wild type - F	CGT GAT CTG CAA CTC CAG TC
	rtTA wild type - R	GGA GCG GGA GAA ATG GAT ATG
Pax2-Cre	Cre - Forward	AAC ATG CTT CAT CGT CGG TCC GGG CTG C
	Cre - Reverse	GAC GGA AAT CCA TCG CTC GAC CAG TTT A
Atoh1/nEGFP	GFP - Forward	CGA AGG CTA CGT CCA GGA GCG CAC CAT
	GFP - Reverse	GCA CGG GGC CGT CGC CGA TGG GGG TGT TCT GC