Table 1.

Estimation of the molecular mass of the large subunit of Rubisco extracted from various plants, based on the Western blot analysis

Sample	Migration distance (pixels)	Calculated molecular mass (kDa)a	% difference from Rubisco standard
Rubisco standard (from spinach)	2442	52.6
Young celery leaf	2442	52.6	0
Young celery petiole	2436	52.9	0.6
Mature celery leaf	2430	53.3	1.3
Mature celery petiole	2490	50.0	−4.9
Snap pea pod	2412	54.3	3.2
Onion leaf	2448	52.3	−0.6
Bean leaf	2406	54.7	4.0

^a For comparison, the expected molecular mass of the large subunit mature chain of Rubisco from Arabidopsis thaliana on SDS-polyacrylamide gel electrophoresis (PAGE) is 52.7 kDa.