MCA Rediscovered

It looks like someone has rediscovered metabolic control analysis (MCA).

A structural approach to understanding enzymatic regulation of chemical reaction networks Biochem J (2022) 479 (11): 1265–1283. Atsushi Mochizuki

The analysis is exactly the same as MCA but uses different symbols and they focus on the unscaled sensitivities instead. eg the r symbols are the unscaled elasticities. The core equation (4) can be found in equation (1) of the appendix of the following paper, and I am sure its been published elsewhere too:

Taking enzyme kinetics out of control; putting control into regulation. Jan-Hendrik S. HOFMEYR, Athel CORNISH-BOWDEN and Johann M. ROHWER, Eur. J. Biochem. 212, 833-837 (1993).

However, unlike the original MCA, the latest reincarnation doesn't include support for conserved moieties so as it stands it's somewhat limited. Note equation (1) in the above paper includes additional terms to take into account any conserved moieties. 

What is more concerning is that the reviewers of the paper never spotted this duplication of work. 

Some textbooks on MCA: 

Systems Biology: An Introduction to Metabolic Control Analysis (2018)

Understanding the Control of Metabolism (Frontiers in Metabolism Ser. ; No. 2)) 1st Edition (1996)

Fundamentals of Enzyme Kinetics 4th Edition (2012)