41. Research and brain autopsies have implicated both dopaminergic system and iron insufficiency in the substantia nigra . 42. Some authorities place the subspecies " v-nigra " as a separate species. 43. Up to grows Scots pine ( Pinus sylvestris ) and black pine ( Pinus nigra ). 44. In 1791 Samuel Thomas von S�mmerring alluded to this structure, calling it the substantia nigra . 45. Another cycle, Porta Nigra , dominated by the idea of death, appeared in 1934. 46. Dorsey releases Newt, reasoning that " hanging another Nigra ain't enough this time. 47. The Natchez Indians referred to the area as the Juzlin's Nigra or Walnut Hills. 48. It is a through station, about east of the inner city and the Porta Nigra . 49. Coushattas artists from Texas and Louisiana used the water oak ( " Quercus nigra " 50. Parkinson's disease attacks cells in a tiny portion of the brain called the substantia nigra .
