3.46pm BST Severin Carrell sends this analysis on today's news: When Ruth Davidson was campaigning to win the Scottish Tories' leadership contest she famously stated she would oppose any new tax and legal powers for Scotland – that was a firm, unambiguous "line in the sand".
Yet, as is typical for most questions in the complex world of biology, an unambiguous line between homology and homoplasy is not so easy to draw.
This went beyond the bounds of what he and his colleagues like Gauguin called "cloisonnism", the inlaying of distinct patches of colour, like enamel, with unambiguous bounding lines.
But it also means setting forth unambiguous red lines to preserve the only option for resolving the conflict: a negotiated two-state solution.
This declaration and the established national borders drew clear, unambiguous battle lines.
In 2011, former secretary of state Hillary Clinton had described the issue as an "unambiguous red line for reconciliation with the insurgents", without which the Taliban would not be allowed to be part of a political peace process.
In 2011, the then US secretary of state, Hillary Clinton, had described the issue as an "unambiguous red line for reconciliation with the insurgents", without which the Taliban would not be allowed to be part of a political peace process.
"Good stories are not necessarily simple ones, with unambiguous moral punch lines," she writes.
When considering the ultrastructural changes in CF2 mutants, one correlation is unambiguous: the three lines with the greatest reductions in CF2 protein (08941, 04624, and R3) are the ones that display an enlarged myofibril phenotype.
Although this complicates comparisons and interpretation of the results between the populations, our results were in line and were unambiguous for the commercial line.
In doing so, we provide a criterion for assessment that is unambiguous and in line with many comparable studies [e.g., Alexander and Lange, 2011; Basu et al., 2011; Basu and Pan, 2011; Chun et al., 2011].
