Howeer, optimal iral ector deliery into the brain is challenging and brain distribution of iral ectors is uncertain. 然而，最佳的导入入脑的病毒载体仍需探索，病毒载体的脑内分布也不确定。
Having no pattern in the cardiac muscles,their distribution was often found in the myocardial layers,and occassionally under the epicardium. 在心肌内分布无规律，多见于心肌层，也偶见于心外膜下。
