Binds to the LIM domain of a wide variety of LIM domain-containing transcription factors. Forms homodimers and heterodimers. First expressed at stages 15-16 in presumptive limb mesoderm. As limb outgrowth proceeds, expressed in the entire limb bud, concentrating in the distal mesoderm throughout limb development. Both hindlimbs and forelimbs exhibit similar expression patterns. The dimerization domain is located in the N-terminus. Due to intron retention. Lacks LIM-binding domain. Belongs to the LDB family.