By this we could identify and confirm among others synaptotagmin 5 (Syt5), a synaptic calcium sensor, and a protein with potential relevance for schizophrenia pathology (Kontkanen et al. 2002; Maycox et al. 2009; Martins-de-Souza et al. 2010) as a cellular interaction partner for α-HPy. This evidence concerns the gene SYT5 and schizophrenia.