Furthermore, the median analysis demonstrated that the plasma protein level of HTR1B (+) (HTR1B > 4138.3903 pg/mL) was detected in 29 out of 31 ERVWE1 (+) patients (ERVWE1 > 2043.8078 pg/mL), while the plasma protein level of HTR1B (−) (HTR1B ≤ 4138.3903 pg/mL) was detected in 8 out of 13 ERVWE1 (−) patients (ERVWE1 ≤ 2043.8078), suggesting a consistent expression pattern of HTR1B and ERVWE1 in schizophrenia patients (Table 4). Here, HTR1B is linked to schizophrenia.