Table 1.

Summary of hair phenotypes in mutant mouse strains

Phenotypes	WT	Ta	Ta/ShhTG	ShhKO	Ta/ShhKO
PH germ	+	−	−	+	−
SH germ	+	+	+	+	+
PHF elongation	+	n.a.	n.a.	−	n.a.
SHF elongation	+	+	+	−	−
SH length	L	S	S + L	n.a.	n.a.
Air cells in straight SH	3 or 4	1–2	1–2	n.a.	n.a.

PH, Primary hair; SH, secondary hair; L, long; S, short; n.a., not applicable.