A mouse Cd4 minigene consisting of the mouse Cd3d enhancer and promoter, Cd2 5' UTR-containing exon 1, intron 1 (8.6 kb) and the 5' UTR part of the start codon-containing exon 2, was linked to the human CD2 cDNA sequence, followed by SV40 poly(A) signal sequence. (J:18902)