Table 2. HMP concentrations in uninoculated and partially spent media.

Organism	HMP (pM)
	Uninoculated	Partially spent
Synechococcus sp. WH8102	N/D	2909.6
Dunaliella tertiolecta	11.6	1584.3
Prochlorococcus sp. MED4	N/D	32.8
OM43 isolate HTCC2181	12.9	33.0
Ca. P. ubique strain HTCC1062	11.6	N/D
Pelagibacterales sp. strain HTCC7211	11.6	N/D

Abbreviations: HMP, 4-amino-5-hydroxymethyl-2-methylpyrimidine; N/D, not detected.

Limit of detection=2.4 pM.