ABCB6 and bronchopulmonary dysplasia: The microbial functional prediction analysis revealed that ABC-type transport systems, transcription factors, amino acide, arginine/histidine, oligopeptide, spermidine/putrescine, taurine, thiamine and Zn2 + transport transport were distinctively increased in BPD group, while the ABC-type transport lipoprotein release was decreased in BPD group (Kruskal–Wallis, all P < 0.05) (Fig. 5).