on the basis of the cea immunostaining , the duct-like structures were divided into 4 types : 1 ) mature acrosyringeal structure , 2 ) cystic luminal structure lined by elongated cells , 3 ) immature acrosyringeal structure , and 4 ) vacuole- or dot-like potential lumen in a single cell .
C0042219
vacuole
C0007634
cell