Table 4.

Sizes of polypeptide precursors (No. aa Residues)^*.

Organism	ZP1	ZP2	ZP3	ZP4	ZPd	ZPax
Trout	563/524a		441			(698)b
Frog		699	460	544	376	905
Chicken	934	695	446	543	418	837
Possum		712	422	527
Mouse	623	713	424
Rat	617	695	424	545
Cow		713	421	534
Pig		716	421	536
Dog		715	426	531
Macaca	640	745	424	539
Chimpanzee	638	745	424	540
Human	638	745	424	540

^*Taken from NCBI database.

^aZP1α/ZP1β.

^bGilthead seabream ZPx.