most symptoms , not unexpectedly , come from the ciliated epithelia , but two further symptoms are : ( 1 ) male sterility caused by the spermatozoa being unable to swim progressively ( the sperm tail has the same structure as a cilium ) , and ( 2 ) situs inversus in 50 % of the cases possible caused by an inability of embryonic cilia to shift the heart to the left side .
C0037868
spermatozoa
C0037851
sperm tail