"may became" is grammatically correct and can be used in written English.
It is the past tense form of "may become" and is used to indicate possibility or uncertainty in the past. Example: Despite my initial doubts, the new project may have become a success.
With Aydar, Dnipr, Luhansk, and Azov battalions' candidates in parliament, the Rada may became a new kind of battlefield.
In addition to that, it was important to assess the biodegradability of the whey protein layer itself since natural polymers may became not degradable if cross-linked or blended with not degradable additives.
Although the cost of lithium titanate battery is relative high, it has high security, long life cycle, good charge/discharge characteristics, which may became future development direction of lithium ion battery.
On 8 May the British preliminary bombardment began and on 23 May became much heavier.
In cells exhibiting high metabolic rates, such as rapidly dividing cancer cells grown in vitro, glutamine, being the most readily available amino acid used as energy source, may became the major source of energy to sustain protein and nucleic acid synthesis [11], especially when glucose levels are low and energy demand is high.
A consequence of this further reduction of the set F q, r is that fragments that were previously removed because of pairwise inconsistencies, may became consistent again.
Munoz et al. [ 32] reported that children who have experienced a severe allergic reaction may became withdrawn and fearful, or develop disordered eating patterns.
It is also plausible that as the fibril aggregates become shorter, the cohesion between individual fibrils may became weaker, resulting in a decrease in LFAD due to cleavage of the fibril aggregates.
In this scenario, biomarker-driven clinical trials with targeted agents for patients with metastatic breast cancer with relatively rare but 'actionable' mutations may became crucial and biopsy of the metastatic tissues will be essential.
These problems may result in discrepancies between gene trees and a species classification based on other data, which may became apparent if the markers are sequenced from several individuals of each species.
When May became home secretary in May 2010, she was the sixth holder of the post in six years.
