+------COMP:V_PASS-N(in)------+    
                             |         +----MOD_ATT:N-N----+    
                             |         |    +--MOD_ATT:N-N-+    
    +MOD_ATT+--SUBJ:V_PASS-N-+         |    |    +MOD_ATT:N+    
    |       |                |         |    |    |         |    
 __SP__ __NODE__ gene is involved in body mass index of __SP__ .
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V_PASS-N (involve,__NODE__)
COMP:V_PASS-N(in) (involve,__SP__)
MOD_ATT:N-N (__SP__,body)
MOD_ATT:N-N (__SP__,mass)
MOD_ATT:N-N (__SP__,index)