視覺基因(綠色)聚集在夜行性大鼠的細胞核邊緣(上圖),而活躍於白天的金花鼠,視覺基因則位於細胞核中央(下圖)。<br>影像來源/ "NUCLEAR ARCHITECTURE OF ROD PHOTORECEPTOR CELLS ADAPTS TO VISION IN MAMMALIAN EVOLUTION," BY IRINA SOLOVEI, MORITZ KREYSING, CHRISTIAN LANCTOT, SÜLEYMAN KÖSEM, LEO PEICHL, THOMAS CREMER, JOCHEN GUCK AND BORIS JOFFE, IN CELL, VOL. 137, NO. 2; APRIL 17, 2009