Two unrooted maximum likelihood trees of phosphatidylserine
synthase/archaetidylserine synthase (PSS/ASS). Each sequence is
indicated by the source name and the GI number from the National
Center for Biotechnology Information. The colors for each
species are the same as in Figure
3. The reliability index of a cluster is only shown when
the value is equal to or greater than 0.25. The log likelihoods
were –7157.86 and –18485.60 for phosphatidylserine
decarboxylase-A and -B (PSD-A or PSD-B), respectively. The
optimal shape parameter alpha was 0.85 (145 sites) for PSD-A and
1.13 (197 sites) for PSD-B. The presence or absence of ASS or
PSS-II in each species is indicated by a symbol, ‘+’
or ‘–’, near the source name. The symbol,
‘+’, colored red, shows that the genes or open
reading frames for PSS/ASS and PSD/ASD are tandemly encoded.
When the species uses PSS-I instead of PSS-II, the symbol
‘+’ is replaced with ‘I’.