When the Outside World Reaches the Embryo
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 5
What the developmental and epidemiology literature actually says about three common prenatal exposures (SYNTHESIS.md Section 4.4; PMID:28550290).
Piece 2 of 5
Low maternal folate (a B-vitamin that supplies methyl groups): periconceptional folic acid is studied as a modifiable factor that may lower cleft risk; biologically plausible and recommended, but the protective size for clefts is debated and less settled than for neural-tube defects.
Piece 3 of 5
Maternal smoking (tobacco smoke in pregnancy): repeatedly associated with higher cleft risk across many studies; an established statistical association whose exact mechanism is still being worked out.
Piece 4 of 5
Valproate (an anti-seizure or mood medication): listed among anti-epileptic-drug exposures studied as cleft and birth-defect risk factors; a recognized teratogen class where dose and timing matter.
Piece 5 of 5
Timing matters too: an exposure at week 6 to 9 overlaps the growing, elevating, fusing palate; an exposure at week 20 arrives long after the palate has fused (PMID:26589921).
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.