Table 2. Metabolic markers highly predictive (pred) in both testcross (TC) populations and those specifically for heterosis (het) prediction in one certain testcross set-up, each in alphabetical order.

Highly pred in both TC set-ups	Specific for C24-het prediction	Specific for Col-het prediction
Alanine	Fumaric acid	Gluconic acid
Cellobiose	Galactose	Glycerol-3-phosphate
Glycine	Glucose-6-phosphate	Fructose-6-phosphate
Oxalic acid	Maleic acid	2,4-Hydroxy butanoic acid
Propanoic acid	Maltose	α-Tocopherol
Urea	Putrescine	5 Unknowns
7 Unknowns	Raffinose
	Salicylic acid
	Tyrosine
	7 Unknowns