The overrepresentation of these pathways is mainly based on molecules including ADCY9, ITPR1 and PRKCZ. We also find evidence that several disorders/diseases, such as those in connective tissue, development and digestive system, and such cellular functions as cellular movement, assembly and organization involving in tumour cell migration and endocytosis of liposome are potentially influenced by twin birth. This evidence concerns the gene ITPR1 and neoplasm.