TABLE 2.

Distribution of 260 nm absorbance in Ribosomal Fractions of S. purpuratus eggs and early embryos^a

Expt	Stage	Percentage inhibition with emetine	Number of transits in emetine	Percentage A260 nmb
					Polyribosomes
				Monoribosomes	Small	Large
1.	UF eggs	Control (2)		86.2 ± 1.7	8.4 ± 0.9	5.4 ± 0.8
	UFeggs	90–70 (2)	0.6/1.63	86.5 ± 0.8	7.5 ± 0.5	5.9 ± 0.3
2.	Zygotes	Control		72.0	12.4	15.6
	2-cell	Control		68.2	13.6	18.2
	2-cell	75–40	2.3	69.9	16.8	13.3
	4-cell	Control		69.5	13.9	16.6
	4–8-cell	75–40	5.0	70.7	13.5	15.9
	8–16-cell	Control		69.3	13.9	16.8
	16-cell	75–40	6.4	69.8	13.5	16.7
3.	Early Bl	Control (3)		60.4 ± 3.5	25.5 ± 1.3	14.1 ± 2.3
	Early Bl	72–40	1.3	44.5	30.5	24.7

^aConditions and stages as in Table 1.

^bThe distribution of material absorbing at 260 nm was determined graphically.