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Biol Bull 117: 319-326. (October 1959)
© 1959 Marine Biological Laboratory
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ANTIGENIC DIFFERENCES BETWEEN STEM AND HYDRANTH IN TUBULARIA

JOHN B. MORRILL JR. 1

1 Oceanographic Institute, Florida State University, Tallahassee, Florida

1. The antigenic composition of hydranths and stems of Tubularia crocea has been studied by means of the precipitin ring tests, Ouchterlony agar gel diffusion tests, and immunoelectrophoresis.

2. Precipitin ring tests showed that antiserum against whole animals contained precipitating antibodies but failed to reveal antigenic differences between hydranths and stems.

3. Ouchterlony tests of anti-whole animal serum and saline extracts of hydranth and stem tissues revealed the following:

a. Four antigens common to both regions of the animal.

b. One stem antigen with hapten sites similar to those on two hydranth antigens.

c. Two antigenic substances limited to stems.

d. One antigenic substance limited to hydranths.

e. One stem antigen with at least two haptens—one in common with a hydranth antigen and one which was not related to any precipitating hydranth antigens.

4. Six stem antigens and six hydranth antigens had comparable electrophoretic mobilities.






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