Expression of the human

SCL gene. Northern analysis of poly(A)⁺ RNA from E14.5 fetal liver hybridized with a lacZ probe to detect expression of the human SCL/lacZ transgene, a 3′ UTR probe for endogenous mouse scl, and a GAPDH probe as a control for mRNA loading. RNA was obtained from the indicated transgenic lines as well as from a wild-type control (WT).