Fig, G. Portion of a notochord cell in Amblystoma larvae, n = nucleus; 

 ne = nuclear envelo])e consisting of two membranes and a perinuclear space 

 in between; er = endoplasmic reticulum; m = membrane of ER which is 

 continuous with outer membrane of nuclear envelope so that the perinuclear 

 space is continuous with cavities of ER at spot marked "X". 

 Magnification = 26,666. (Kindly loaned by K. R. Porter, unpublished.) 



