The phrase "a relatively protracted development" is correct and usable in written English.
It can be used to describe a process or situation that has taken a longer time than usual to develop, often in a comparative context.
Example: "The project faced a relatively protracted development due to unforeseen challenges and resource constraints."
Alternatives: "a somewhat lengthy development" or "an extended development period".
Among 91 hepatitis E cases, acute marker profiles of 82 cases are compatible with primary infection, reflecting a vigorous IgM response, a relatively weak and transient IgG response with production of low avidity IgG and a relatively protracted viremia.
As noted previously (e.g., Palmer et al., 2007; Koenig et al., 2011; Yatsunenko et al., 2012), the development of the gut microbiota involves profound alterations in diversity and composition that take place over a relatively protracted timeframe (nominally, 0 3 years in age) (Table 2 and Figure 2).
By contrast, epiSCs with Klf2 alone produced GFP-positive cells but in a relatively protracted manner on day 6 7, and more robustly on day 9, compared to a highly accelerated rate of reprogramming by Prdm14 and Klf2.
Coupled with the fact that such mutations were observed at several discrete levels of ploidy, these data suggest that the genomic rearrangements driving the amplifications in these patients were acquired over a relatively protracted period of molecular time.
In contrast, connections between the lateral frontal cortices and other cortical and subcortical areas show a particularly protracted development (Giedd et al. 1999).
By all accounts, Quantum Break had a bumpy and protracted development.
First pitched in 2009, Diamond Trust of London went through a protracted development process, going through two publishers and taking over three years to reach the market.
However, other types of visual motion processing follow a protracted development and only reach adult-like levels by mid-to-late childhood.
Hypotheses concerning the transport of grain from elsewhere, such as the western Fertile Crescent, can indeed be used to explain a protracted development of domesticated species.
