Potensi karakteristik dan diferensiasi sel punca mesenkimal sumsum tulang krista iliaka pasien lupus eritematosus sistemik yang menderita nekrosis avaskular kaput femur = Potency characteristic and differentiation of iliac crest bone marrow derived mesenchymal stem cell of systemic lupus erythematosus patients complicated with avascular necrosis of femoral head / Sukry Asdar Putra Hasibuan