The phrase "and mostly so" is correct and usable in written English.
It can be used to indicate that something is true to a large extent or in most cases.
Example: "The results of the experiment were positive, and mostly so for the control group."
Alternatives: "and largely so" or "and primarily so".
And mostly, so are ripped-from-the-headlines plots.
On June 1, Mr. Strickland and Mr. Nuti finally spoke — by telephone, though — and mostly so that NCR could say goodbye.
Over the past 15 years, Roth's production has been so steady, so various and (mostly) so excellent that his vote has been, inevitably, split.
In accordance, the benthic primary producers were generally less nutrient limited at high snail density and mostly so at high levels of snail parasitism.
The transcriptome analysis showed that phk was expressed in the wild type cultivations on all carbon sources and mostly so on glucose and glycerol.
An examination of the expression indices of phk in the wild type strain on the four carbon sources showed that it is, indeed active, and mostly so on glucose and glycerol.
With respect to the gynecological side-effect such as ovarian cysts and uterine fibroids, these always occurred a few months after taking the drugs, and were mostly so mild and stable that we did not need to disrupt the endocrine therapy.
The group had no real operations and existed mostly so that Stone could refer to its acronym.
In addition, bonuses will be allocated based on quantitative things such as % increase in comments and traffic, mostly so that smaller blogs can get a little extra money in the bank as their blog grows.
The variance among alignments in GC content is generally lower in mouse than in pig and human, but mostly so for coding sequences, followed by the UTR and intron regions (Table 2).
He began buying up small local phone companies and excess fiber-optic capacity in places like Spokane, Wash .and rural Pennsylvania, mostly so McCaw could study the local phone business.
