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Cover:
Male pygmy
marmoset (Cebuella
pygmaea) carrying his twin
set of offspring. In two
other closely related
species, a correlation
between direct parental
care and prolactin could
be shown (photograph by
W. R. Spira). See "Prolactin,
the Hormone of Paternity"
by Carsten Schradin and
Gustl Anzenberger, p. 223,
this issue.
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