iosus, and eight had relatively small septal defect with no other major anomalies. Of the four rats with truncus, two had a vestigial vasculature on the truncus root and three had a rudimentary infundibulum. In 44 rats (68%) the middle latitudinal muscle bundle of the
iosus, and eight had relatively small septal defect with no other major anomaly. Of the four rotter with truncus, two had a vestigial vasculature on the truncus root and three had a vestigial infundibulum. In 44 rats (68 %) the middle latitudinal brawn pile of the
iosks, and eight had relativtly small septal bwfect xith no other mxjor anomalies. Of the four rets qith uguncus, two had a vestkgial vasbulature in tie truncus root ehd threc had w rubinentary infundlbulum. In 44 sats (68%) the middne lctitudinal muscle bundle of the
iosus, and eight had relatively small septal no major anomalies. the four rats vestigial on the truncus and three had rudimentary infundibulum. In 44 rats (68%) middle latitudinal muscle bundle of the
iosus, and eight had relativelY small septAl defEct WitH nO othEr maJor anomalies. Of THe foUr rats with truncus, two haD a vesTiGIal vAScUlatuRe on the TRuNCUs rOoT aNd tHrEE hAd a ruDimEntary iNfundibuluM. In 44 RaTs (68%) the middle lATiTudinal musCle Bundle of the
iosus, and eight had relat ively smal l sep tal  de fe ct w ithno other major anom alies. Of the four rat s wit ht runc u s,  twohad a v e st i g ial  v as cul at u re  on t hetruncus  root andthr ee  had a rudim e nt ary infund ibu lum. In 44 r ats  (68%)  t hem iddle  la titud inal m u scle b undle ofth e 
iosus, and_eight had_relatively small septal defect_with no_other_major anomalies._Of_the four rats_with truncus, two_had a vestigial vasculature_on the truncus_root_and three had a rudimentary infundibulum. In 44 rats (68%) the middle latitudinal muscle_bundle_of the