Sentence examples similar to pseudo-obligatory from inspiring English sources

Three classes of XY homologous gene can be distinguished [Affara et al., 1996]: within the 3.5 Mb pseudo-autosomal region 1 (Pat1) athehe short arm telomeres of the X and Y chromosomes a single obligatory recombination occurs in each male meiosis, and strict homology between genes on the X and Y is maintained.

Condoms obligatory.

Obligatory listening.

4) Obligatory Tebow.

Obligatory photo at Glen Pass.

There is obligatory scatology.

* The obligatory druid interview.

"It was obligatory.

"It's obligatory".

Sharing is almost obligatory.

But is it obligatory?