. 2021 Apr 6;16(4):e0249432. doi: 10.1371/journal.pone.0249432

Table 1. Symbols used in reporting results between two embryos populations exposed to clean and polluted sediment extracts.

	Treatment
Embryo Population	Clean Sediment Extract = C²	Polluted Sediment Extract = P²
Magotha–Sensitive = C¹	C¹C² = CC	C¹P² = CP
Elizabeth River–Resistant = P¹	P¹C² = PC	P¹P² = PP

Two F. heteroclitus embryo populations–sensitive (C1) and resistant (P1) were exposed to clean reference site sediment extracts from Magotha Bay, VA (C2) and PAH-polluted sediment extracts from Elizabeth River, VA (P2), resulting in four embryo treatment groups. Embryos’ development–PAH content, time-to-stage, heart rates, morphology, and gene expression were analyzed during four developmental stage: Early somitogenesis (21), heart differentiation (25), organodifferentiation (31), and pre-hatching (35).