+-------------SUBJ:V-N-------------+    
       +--------COMP:N-N(in)-------+      |    
       +-COMP:N-N(of)+       +MOD_A+      |    
       |             |       |     |      |    
 Localization of IGF 1 in Leydig cells occurs .
COMP:N-N(of) (localization,1)
COMP:N-N(in) (localization,cell)
MOD_ATT:N-N (cell,Leydig)
SUBJ:V-N (occur,localization)