TXLNB and Brachycephaly: A chromosomal inversion In(10)17Rk resulting in a fused Hmga2 transcript with a novel 5′ sequence in which Hmga2 exon 4 and 5 combined with Txlnb (taxilin beta) exon 1 and exon 2, also caused a similar pygmy phenotype including reduced birth weight and brachycephaly (Zhou et al. 1995).