m-NfX.1 is ubiquitously expressed in adult tissues. Semiquantitative reverse transcription–polymerase chain reaction (RT–PCR) showing expression of m-NfX.1 in all tissues tested. Lu, lung; Te, testis; Sk, skin; Sp, spleen; Th, thymus; Li, liver; St, stomach; Sm.Int., small intestine; Sk.Mu., skeletal muscle; E8·5, 8·5 d.p.c. whole embryo; E12·5, E12·5 d.p.c whole embryo; E19, E19 d.p.c whole embryo; Br.L., breast lactating; Br.P., breast pregnant; Br.V., breast virgin. All tissues tested show detectable levels of m-NfX.1 mRNA. Four crescent concentration of cDNA were used for each tissue tested.