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During self conjugation two cells from a 6-day old culture come
together, bridges are formed between them and haploid products of
meiotic division of their micronuclei are exchanged between the mating
pairs. Two micronuclei are seen here which appear similar to the
haploid pronucleus in the paper of Inaba et al. (Proc. Japan Acad.
42:394-398, 1966) which is passing through such a bridge in P.
multimicronucleatum. In this micrograph two rounded micronuclei
are lying very near the macronucleus (mac). These may be the
migratory and stationary pronuclei that will form the diploid
synkaryon nucleus from which the new micronuclei and macronucleus will
form after further mitotic divisions. Interestingly one of these
nuclei appears to be in close contact with the macronucleus. EM taken
on 3/4/80 by R. Allen with Hitachi HU11A TEM. Neg. 5,000X. Bar = 1µm.
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