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Yacarol 18:203
Yaverlandia 9:105–106
Yearly cycles (see also Cycles) 5:34
Yeast 8:566
Yellow-bellied sea snake (see Pelamis)
Yellow cells (see Enterochromaffin cells)
Yolk (see also Eggs; Vitellogenesis; Water) 3:36– 37, 53, 218; 6:82, 84, 96–97, 101–102,104, 107, 110–113, 118; 11:8; 12:305–307; 13:78, 236–237, 241, 244, 248, 255, 265, 274–276
absorption 14:362, 379–380, 394, 397; 15:541, 543, 547
and albumin 14:119, 275, 378
and development 14:17
as energy source 14:316
blood vessel penetration 14:165
calcium 14:375
chemical composition 14:314–316
cleft 15:540–542, 547–549, 559
digestion (utilization) 14:163, 232, 311, 362, 377, 380
fat content 15:565
formation (see also Vitellogenesis) 15:347
granules 14:311, 378; 15:543, 551
in primordial germ cells 14:44; 15:170
lipid 14:236, 315–316
lipoprotein 14:377
loss 14:230
movement 14:118, 379
nucleus 14:55–56, 64
plug 14:114–115
precursors 14:64; 15:592
protein 14:64, 236, 315–316, 342
protein content 15:566–567
reduction of 15:529
sac 3:222; 6:110; 14:18, 96, 101, 119, 160–168, 179, 176, 193, 197–198, 230, 235, 237, 239–240, 311, 377, 379–380, 400, 439, 499, 512, 635–636
absorption by 15:529
blood vessels 15:536, 538, 542
ectoderm 15:543, 547
endoderm 15:534, 536, 542, 546, 548, 559
mesoderm 15:534, 536
placenta (see Placenta, yolk sac)
scar 14:416
stalk 14:138, 146, 165; 15:536
viscosity 14:377
water potential 14:232
Yoshida sarcoma cells 8:510
Young (see also Hatchlings; Juveniles; Reproduction) 13:8, 58–60, 82, 113, 116–117, 122, 125, 128, 130–131, 206
Youngina 9:296; 20:1, 4, 20, 71, 249, 257, 259, 272, 285
capensis 20:290
dentition 1:151
origin and evolution 1:7
Younginidae, origin and evolution 1:7
Youngoidea 9:296
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